A12 junction 25 Marks Tey to junction 26 Stanway - concrete roads reconstruction
We're rebuilding the A12 between junction 25 at Marks Tey and junction 26 at Stanway. This will improve the safety, create a smoother quieter journey, and extend the life of the road to make it fit for the future.
Latest updates
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13 September 2024
Planned overnight closures September 2024
While we continue to work towards the completion of our work to rebuild this stretch of the A12 road, we will need to close the northbound and southbound carriageways. These closures will allow us carry out final surfacing and finishing work, and remove traffic barriers and cones. Diversions will be in place, so please check the details below before you travel. Thanks for your patience!
Closures:
- 15–20 September 2024 (8pm–6am):
A12 southbound closed between junction 26 (Stanway) and junction 25 (Marks Tey). - 19 & 20 September 2024 (8pm–6am):
A12 northbound closed between junction 25 northbound exit and entry slip roads. - 21 & 22 September 2024 (8pm–6am):
A12 southbound closed between junction 29 and junction 25 (Marks Tey).
Diversions:
- Southbound (15–20 September 2024):
Exit at J26 Stanway, follow A1124 and B1408 (London Road), then re-join the A12 at J25 Marks Tey. - Northbound (19 & 20 September 2024):
Exit at J25 Marks Tey, go over the junction, and re-join the A12 via the J25 northbound entry slip road.
- Southbound (21 & 22 September 2024):
Exit at J29, follow A1232 Ipswich Road, A133 (Cowdray Avenue), and B1408 (London Road), then re-join the A12 at J25 Marks Tey.
Diversion routes will be clearly signed. Please plan ahead and allow extra time for your journey.
Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England site. Our travel alerts give details of live incidents on our network.
- 15–20 September 2024 (8pm–6am):
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06 September 2024
Updated road closure information, September 2024
We will be carrying out some overnight closures of both the northbound and southbound carriageways while we continue to safely complete our work to rebuild this stretch of the A12 road and carry out out final surfacing and finishing work.
During these road closures, diversions will be in place, so please check the dates below before starting your journey. Thank you for your patience during these roadworks.
Upcoming road closure dates
A list of our updated planned road closures for the coming week are shown below.
8 - 10 September 2024, between 8pm and 6am each night:
A12 closed northbound overnight between junction 25 Marks Tey and junction Stanway for barrier removal and finishing work.
During these times, traffic will be diverted to exit the A12 via the junction 25 northbound exit slip road at Marks Tey and follow the signed diversion route along B1408 (London Road) to Stanway, re-joining the A12 northbound via the Junction 26 northbound entry slip road.
Diversion map
11 - 15 September 2024, between 8pm and 6am each night:
A12 closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 26 Stanway and travel along the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Diversion map
The dates listed above will be subject to factors including weather and work progress.
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30 August 2024
Final phase of weekend closures - September 2024
To safely complete our work to rebuild this stretch of the A12 road, we’ll need to have a final phase of weekend road closures, which will include some overnight closures of both the northbound and southbound carriageways.
During these road closures, diversions will be in place, so please check the dates below before starting your journey. Thank you for your patience during these roadworks.
1 - 4 September 2024, between 8pm and 6am each night:
A12 closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 26 Stanway and travel along the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road. Diversion shown below.
5 - 7 September 2024, between 8pm and 6am each night:
A12 closed southbound overnight between junction 29 and junction 25 for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 29 and travel along the A1232 Ipswich Road, A133 (Cowdray Avenue), B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road. Diversion shown below.
The dates listed above will be subject to factors including weather and work progress.
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21 August 2024
Reminder about road closures during August and September 2024
We’ll need to have a final phase of weekend road closures during August and early September so that we can safely complete our work to rebuild this stretch of the A12 road, as well as some overnight closures of both the northbound and southbound carriageways while we carry out final surfacing and finishing work.
During these road closures, diversions will be in place, so please check the dates below before starting your journey. Thank you for your patience during these roadworks.
Road closures
The latest list of our planned road closures is below.
19 - 22 August 2024, between 8pm and 6am each night:
A12 closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
27 - 30 August 2024, between 8pm and 6am each night:
A12 closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Note: No planned closures on Bank Holiday Weekend (23 - 26 August 2024).
The dates listed above will be subject to factors including weather and work progress.
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16 August 2024
Full weekend road closure, 6am on 17 August to 8pm on 18 August 2024
Despite challenging wet weather conditions over the winter months and earlier in the summer, we have been working extremely hard to keep work on schedule and complete reconstruction of the old concrete road surface of the A12 between Marks Tey and Stanway.
Due to these efforts, we are in a position to bring our planned weekend of working forward by two weeks to this coming weekend, instead of the end of August as originally scheduled.
This means that this weekend, 17 and 18 August 2024, we will be diverting both lanes of the A12 southbound between the junction 25 exit slip road and junction 25 entry slip road at Marks Tey. This full weekend closure will allow us to complete our work in hard-to-reach areas of the carriageway.
Unlike previous weekends, this closure will require all southbound traffic to be diverted up and over junction 25 by exiting the A12 via the junction 25 southbound exit slip road and rejoining the A12 via the junction 25 southbound entry slip road. This full diversion will be in place between 6am on Saturday 17 August until 8pm on Sunday 18 August 2024.
During this time, the southbound entry slip road at junction 26 will also be closed to help manage traffic build up in the area. Additional traffic signals will also be in place at both Prince of Wales roundabout and Stane Retail Park to help assist with traffic movement.
Please note: the A12 will also be closed southbound between junction 26 Stanway and junction 25 Marks Tey this Friday and Sunday evening to allow for the weekend roadworks to be safely installed and uninstalled.
Once the weekend work is done, we will be having overnight closures to allow us to continue work to complete this scheme. Further details on other closures in the coming weeks is further down in this information.
Diversion routes
During this time, the diversion route below will be in place:
- Southbound traffic will be diverted off the A12 at junction 25 Marks Tey via the southbound exit slip road. Customers wishing to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
Please note: Customers travelling to Stansted Airport will be able to access the A120 from junction 25 as normal.
If you are travelling from further afield, please use alternative routes to avoid our closure.
If you do need to travel in the area, please leave a lot of extra time for your journey.
We know there’s never a good time to divert a busy road like the A12 and understand closures can cause disruption to journeys, for which we apologise.
We carefully plan all of our closures to limit disruption, but sometimes it is not possible to undertake the work that is needed without a closure. This essential work needs to be done for us to complete the final areas of reconstruction work within the carriageway, and allow us to open for traffic at the end of the summer as planned.
During this weekend’s full weekend road closure, we urge customers to:
- Plan ahead
- Avoid unnecessary travel
- Follow the diversion routes and signage in place and not sat nav’s
- Expect delays and allow more time for your journey when travelling in the area.
We understand the challenges customers face when driving through roadworks and we thank you for your continued patience while we complete this important work.
Parking
The parking suspension on London Road will be extended to include Sunday 18 August. Customers wishing to access businesses on London Road will need to park in designated parking areas.
Future road closures
We’ll need to have a final phase of weekend road closures during August and early September so that we can safely complete our work to rebuild this stretch of the A12 road, as well as some overnight closures of both the northbound and southbound carriageways while we carry out final surfacing and finishing work.
During these road closures, diversions will be in place, so please check the table below before starting your journey. Thank you for your patience during these roadworks.
The latest list of our planned road closures is below:
Dates of closure
Closure details
Diversion Route
Weekend work
16 - 19 August 2024
A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey on Friday from 8pm until 6am Saturday to put in roadworks.
Then full closure of the A12 southbound between Junction 25 exit slip road and Junction 25 entry slip road from 6am Saturday until 8pm Sunday.
Then closed Junction 26 to Junction 25 on Sunday night until 6am on Monday to remove roadworks.
Full closure of the A12 carriageway between junction 25 southbound exit slip road, and junction 25 entry slip road.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey on Friday and Sunday evening to allow for the traffic management for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
All A12 southbound traffic will be diverted up and over junction 25, exiting the southbound carriageway via the southbound exit slip road, and re-joining the A12 southbound the other side of the junction via the junction 25 southbound entry slip road.
During this time, the southbound entry slip road at junction 26 will also be closed to help manage traffic build up in the area. Additional traffic signals will be in place at both Prince of Wales roundabout and Stane Retail Park to help assist with traffic movement.
Overnight closures from Junction 26 to Junction 25 on A12 southbound
19 - 22 August 2024
Between 8pm and 6am each night
A12 closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Southbound traffic will be diverted to exit at Junction 26 Stanway and travel along the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Bank Holiday Weekend 23 - 26 August 2024
No planned closures
Overnight closures from Junction 26 to Junction 25 on A12 southbound
27 - 30 August 2024
Between 8pm and 6am each night
A12 closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Southbound traffic will be diverted to exit at Junction 26 Stanway and travel along the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The dates listed above will be subject to factors including weather and work progress.
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07 August 2024
Closures during August and September 2024
We’ll need to have a final phase of weekend road closures during August and early September so that we can safely complete our work to rebuild this stretch of the A12 road, as well as some overnight closures of both the northbound and southbound carriageways while we carry out final surfacing and finishing work.
During these road closures, diversions will be in place, so please check the table below before starting your journey. Thank you for your patience during these roadworks.
The latest list of our planned road closures is below:
Dates of closure
Closure details
Diversion Route
Overnight closures from J26 to J25 on A12 southbound
7 - 11 August 2024
Between 8pm and 6am each night
A12 closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Southbound traffic will be diverted to exit at Junction 26 Stanway and travel along the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Weekend work
10 - 11 August 2024
Daytime lane closure between 6am and 8pm each day
We will be undertaking some work in hard-to-reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic during the day, but with some changes to the road layout around junction 25 Marks Tey.
The A12 southbound will be fully closed overnight from 8pm to 6am both evenings (see above).
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past Junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
Overnight closures from J26 to J25 on A12 southbound
12 - 16 August 2024
Between 8pm and 6am each night
A12 closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Southbound traffic will be diverted to exit at Junction 26 Stanway and travel along the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Weekend work
16 - 19 August 2024
Lane closure in place between 6am Saturday and 8pm Sunday
We will be undertaking some work in hard-to -reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Southbound traffic will be diverted off of the A12 at junction 25 southbound exit slip road. Customers wishing to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
Overnight closures from J26 to J25 on A12 southbound
19 - 22 August 2024
Between 8pm and 6am each night
A12 closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Southbound traffic will be diverted to exit at Junction 26 Stanway and travel along the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
Bank Holiday Weekend 23 - 25 August 2024
No planned closures
Overnight closures from J25 to J26 on A12 northbound
26 - 31 August 2024
Between 8pm and 6am each night
A12 closed northbound overnight between junction 25 Marks Tey and junction 26 Stanway for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 25 Marks Tey and travel along the B1408 (London Road), A1124, and re-join the A12 northbound at Junction 26 Stanway northbound entry slip road.
Northbound traffic will be diverted to exit the A12 via the junction 25 northbound exit slip road at Marks Tey and follow the signed diversion route along B1408 (London Road) to Stanway, re-joining the A12 northbound via the Junction 26 northbound entry slip road.
Weekend work
30 August - 2 Sept
Between 8pm on Friday 30 August and 6am on Monday 2 September 2024
Full closure of the A12 carriageway between junction 25 southbound exit slip road, and junction 25 entry slip road.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
All A12 southbound traffic will be diverted up and over junction 25, exiting the southbound carriageway via the southbound exit slip road, and re-joining the A12 southbound the other side of the junction via the junction 25 southbound entry slip road.
Overnight closures from J25 to J26 on A12 northbound
2 - 6 September 2024
Between 8pm and 6am each night
A12 closed northbound overnight between junction 25 Marks Tey and junction 26 Stanway for final surfacing and finishing work.
During this time, traffic will be diverted to exit at Junction 25 Marks Tey and travel along the B1408 (London Road), A1124, and re-join the A12 northbound at Junction 26 Stanway northbound entry slip road.
Northbound traffic will be diverted to exit the A12 via the junction 25 northbound exit slip road at Marks Tey and follow the signed diversion route along B1408 (London Road) to Stanway, re-joining the A12 northbound via the Junction 26 northbound entry slip road.
The dates listed above will be subject to factors including weather and work progress.
Diversion maps for Southbound closures:
Diversion maps for Northbound closures:
Diversion maps for Final weekend work:
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24 July 2024
Progress update and road closure dates for 26 July to 2 September 2024
We are pleased to let you know that our work to reconstruct the A12 junction 25 exit slip road was finished on schedule, and the slip road is now open for traffic.
We have also continued to make great progress on rebuilding the main A12 carriageway between junction 25 and 26. We’ll need to have a final phase of weekend road closures during July and August so that we can safely complete our work to rebuild this stretch of the A12 road. During these road closures, a diversion will be in place, so please check the table below before starting your journey. Thank you for your patience during these roadworks.
The latest list of our planned road closures is below:
Dates of closure
Closure details
26 - 29 July 2024
09 - 12 August 2024
16 - 19 August 2024
Between 8pm each Friday evening and 6am each Monday morning
We will be undertaking some work in hard-to -reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
30 August - 2 Sept
Between 8pm on 30 August and 6am on 2 September 2024
Full closure of the A12 carriageway between junction 25 southbound exit slip road, and junction 25 entry slip road.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The dates listed above will be subject to factors including weather and work progress.
Diversion
During 26 to 19 August 2024 road closures
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past Junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
During 30 August to 2 September road closures
All A12 southbound traffic will be diverted up and over junction 25, exiting the southbound carriageway via the southbound exit slip road, and re-joining the A12 southbound the other side of the junction via the junction 25 southbound entry slip road.
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28 June 2024
Updated progress and road closure dates, 24 June to 2 September 2024
Progress Update
Our weekend works and scheme progress on the A12 is currently progressing well, and on schedule for completion later in the summer.
In addition to the current closure of the junction 25 southbound exit slip road, we also have some mid-week overnight road closures coming up on the northbound carriageway.
These road closures are necessary to conduct surveys, inspections and repair defects ahead of the final surfacing in the coming months.
The latest list of planned work is shown below:
Dates of closure
Closure details
Diversion Route
24 June to 19 July 2024
Full closure (24/7) of the southbound exit slip road at junction 25 Marks Tey for around four weeks while we reconstruct the surface on the slip road.
Traffic will continue along the A12 southbound to junction 24 and re-join the A12 northbound via the Junction 24 northbound entry slip road.
2 July 2024
3 July 2024, between 9pm and 6am.
4 July 2024, between 11pm and 6am.
Full closure of the A12 northbound carriageway between junction 25 Marks Tey and junction 26 Stanway.
During these times, traffic travelling along the A12 northbound carriageway will be diverted to exit the A12 via the junction 25 northbound exit slip road at Marks Tey and follow the signed diversion route along B1408 (London Road) to Stanway, re-joining the A12 northbound via the Junction 26 northbound entry slip road.
The southbound carriageway will remain open but reduced to one lane due to the contraflow lane sitting within the northbound carriageway.
19 to 22 July 2024
26 to 29 July 2024
09 to 12 August 2024
16 to 19 August 2024
Between 8pm each Friday evening and 6am each Monday morning
We will be undertaking some work in hard-to -reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past Junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
30 August to 2 Sept
Between 8pm on 30 August and 6am on 2 September 2024
Full closure of the A12 carriageway between junction 25 southbound exit slip road, and junction 25 entry slip road.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
All A12 southbound traffic will be diverted up and over junction 25, exiting the southbound carriageway via the southbound exit slip road, and re-joining the A12 southbound the other side of the junction via the junction 25 southbound entry slip road.
The dates listed above will be subject to factors including weather and work progress. Thank you for your patience.
Diversion for Junction 25 closure, starting 24 June for 4 weeks
All A12 southbound traffic will be diverted up and over junction 25, exiting the southbound carriageway via the southbound exit slip road, and re-joining the A12 southbound the other side of the junction via the junction 25 southbound entry slip road.
See map below.
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26 June 2024
A12 junction 27 northbound exit slip road emergency road closure for slip road repair work
The northbound exit slip road at junction 27 will be closed overnight tonight and tomorrow (26 and 27 June 2024) from 8pm while emergency repair work is carried out to one of the concrete joints within the slip road carriageway.
A lane closure will remain in place on the slip road throughout Thursday and Friday so that the repaired surface can harden properly.
Date of closure
Closure details
Diversion route
Wednesday 26 June
Thursday 27 June
between 8pm and 6am
Closure of the A12 northbound exit slip road at junction 27
Traffic will be diverted via the A12 northbound to junction 29, Ipswich Road, Cowdrey Avenue, Cymbeline Way.
Please note that this is not part of our work to rebuild the road. It is an emergency road closure to repair part of the A12 which has been affected by the current heatwave.
Diversion map
A12 junction 27 slip road diversion -
18 June 2024
Road closure dates, 21 June to 2 September 2024
The weekend closures and works on the A12 are progressing well, ensuring improvements for all users.
Following our works this weekend, junction 25 southbound exit slip road will be closing for around four weeks while we upgrade the road surface within the carriageway. Southbound traffic will be diverted via junction 24.
Full details of our latest planned road closures are below:
Dates of closure
Closure details
Diversion Route
21 - 24 June 2024
Between 8pm on Friday evening and 6am on Monday morning
We will be doing weekend work in hard-to-reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
24 June - 19 July 2024
Full closure (24/7) of the southbound exit slip road at junction 25 Marks Tey for approx. four weeks while we reconstruct the surface within the slip road carriageway.
Traffic will continue along the A12 southbound to junction 24 and re-join the A12 northbound via the Junction 24 northbound entry slip road.
19 - 22 July 2024
26 - 29 July 2024
09 - 12 August 2024
16 - 19 August 2024
Between 8pm each Friday evening and 6am each Monday morning
We will be undertaking some work in hard-to -reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past Junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
30 August - 2 Sept
Between 8pm on 30 August and 6am on 2 September 2024
Full closure of the A12 carriageway between junction 25 southbound exit slip road, and junction 25 entry slip road.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
All A12 southbound traffic will be diverted up and over junction 25, exiting the southbound carriageway via the southbound exit slip road, and re-joining the A12 southbound the other side of the junction via the junction 25 southbound entry slip road.
Diversion map for Junction 25 closure starting 24 June for 4 weeks.
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23 May 2024
Updated progress and road closure dates, 31 May to 2 Sep 2024
Progress Update
We're pleased to announce that our work on the Junction 26 slip road is nearing completion. While we initially hoped to reopen it this weekend, it will now open on 3 June. This will help minimise traffic congestion while we carry out our other planned works this weekend.
The diversion route will remain unchanged and will be closely monitored by our traffic management team.
We understand this delay may cause inconvenience, and we sincerely appreciate your continued patience and support throughout this project. We'll keep you updated on any further developments and thank you again for your cooperation.
The latest of our planned work is shown below:
Dates of closure
Closure details
Diversion Route
Ongoing until 3 June 2024
Full closure (24/7) of the A12 southbound entry slip road at junction 26 Stanway
Traffic will join the A12 northbound at Junction 26 Stanway and travel to junction 27 and re-join the A12 southbound at junction 27 entry slip road.
31 May - 3 June 2024
07 - 10 June 2024
21 - 24 June 2024
Between 8pm each Friday evening and 6am each Monday morning
We will be doing weekend work in hard-to-reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
24 June - 19 July 2024
Full closure (24/7) of the southbound exit slip road at junction 25 Marks Tey for approx. four weeks while we reconstruct the surface within the slip road carriageway.
Traffic will continue along the A12 southbound to junction 24 and re-join the A12 northbound via the Junction 24 northbound entry slip road.
19 - 22 July 2024
26 - 29 July 2024
09 - 12 August 2024
16 - 19 August 2024
Between 8pm each Friday evening and 6am each Monday morning
We will be undertaking some work in hard-to -reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past Junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
30 August - 2 Sept
Between 8pm on 30 August and 6am on 2 September 2024
Full closure of the A12 carriageway between junction 25 southbound exit slip road, and junction 25 entry slip road.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
All A12 southbound traffic will be diverted up and over junction 25, exiting the southbound carriageway via the southbound exit slip road, and re-joining the A12 southbound the other side of the junction via the junction 25 southbound entry slip road.
We thank all customers and local residents for their patience while we carry out this important work.
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15 May 2024
Updated road closure dates, 17 May to 19 July 2024
Due to resources being diverted to the M25 closure at short notice, our weekend work which was due to take place last weekend (10-13 May) around junction 25 of the A12 southbound, had to be rescheduled. We apologise for any inconvenience caused.
We will now be progressing with our weekend work, and the latest list of our upcoming road closures is shown below:
Dates of closure
Closure details
Diversion Route
Ongoing until 24 May 2024
Full closure (24/7) of the A12 southbound entry slip road at junction 26 Stanway
Traffic will join the A12 northbound at J26 Stanway and travel to junction 27, and re-join the A12 southbound at junction 27 entry slip road.
17 to 20 May 2024
Between 8pm on Friday evening and 6am on Monday morning
We will be doing weekend work in hard-to-reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey on Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
23 May 2024
between 8pm and 6am
Full closure of the A12 southbound carriageway between Junction 26 Stanway and J25 Marks Tey
Please note: As part of this closure, the southbound entry slip road at Junction 27 will also be closed for safety. This is due to the Junction 27 slip road joining the A12 carriageway at the same point traffic merges for the diversion between junction 26 and 25.
Traffic will exit at J26 Stanway and travel long the A1124, London Road and re-join the A12 at Junction 25 Marks Tey entry slip road
31 May to 3 June 2024
07 to 10 June 2024
21 to 24 June 2024
Between 8pm each Friday evening and 6am each Monday morning
We will be doing weekend work in hard-to-reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
24 June to 19 July 2024
Full closure (24/7) of the southbound exit slip road at junction 25 Marks Tey for approx. four weeks while we reconstruct the surface within the slip road carriageway.
Traffic will continue along the A12 southbound to junction 24and re-join the A12 northbound via the J24 northbound entry slip road.
19 to 22 July 2024
26 to 29 July 2024
09 to 12 August 2024
16 to 19 August 2024
Between 8pm each Friday evening and 6am each Monday morning
We will be undertaking some work in hard-to -reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at J26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past Junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
30 August to 2 Sept
Between 8pm on 30 August and 6am on 2 September 2024
Full closure of the A12 carriageway between junction 25 southbound exit slip road, and junction 25 entry slip road.
Please note: the A12 will be closed southbound between junction 26 Stanway and junction 25 Marks Tey each Friday and Sunday evening to allow for the lane closure for the weekend works to be safely installed and uninstalled. During this time, traffic will be diverted to exit at Junction 26 Stanway and travel long the A1124, B1408 (London Road) and re-join the A12 at Junction 25 Marks Tey southbound entry slip road.
All A12 southbound traffic will be diverted up and over junction 25, exiting the southbound carriageway via the southbound exit slip road, and re-joining the A12 southbound the other side of the junction via the junction 25 southbound entry slip road.
The dates listed above will be subject to factors including weather and work progress.
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10 May 2024
Upcoming weekend closures, 10 May to August 2024
What have we done so far?
As we move into the final few months of the scheme, we’ve now rebuilt the old concrete road surface on the northbound carriageway, and also lanes 2 and 3 of the southbound carriageway. These rebuilt sections of road currently have a temporary road surface until final resurfacing is completed at the end of the project. We apply the final road surface at final stage to ensure it isn’t damaged during the construction work. This also maximises the life of the road surface and ensures a better quality of finish. In the meantime, you might experience some unevenness or bumps on the temporary surface.
We’ve recycled the old concrete road surface by reusing the old material (including cement) to make the foundations for the new stretches of road. We’ve also installed new kerbs, drainage and safety barriers.
We’ve also recently started rebuilding the southbound entry slip road at junction 26, Stanway. The slip road is currently closed continually (24/7) for approximately four weeks while we work at this location.
What’s happening next?
Following the completion of our recent traffic management switch, we can now begin reconstructing the final sections of the southbound carriageway.
Ahead of finishing the project in the summer, there are some key activities we’ll be doing during the last phase of work:
- Rebuilding the final lane of the southbound carriageway between junction 26 at Stanway and junction 25 at Marks Tey
- Completing work in hard-to-reach areas (these are areas that fall outside, or on the edge of our traffic barriers and safe working areas, meaning it is not safe for our work force or the travelling public for us to work on these sections without closing lanes or making changes to the road layout)
- Rebuilding the southbound exit slip road at junction 25, Marks Tey
- Final resurfacing of both the northbound and southbound carriageways.
Once complete, our project will extend the life of the road, improve safety, and create smoother, quieter journeys.
How will we do this?
Although a lot of our remaining work will be done within our coned-off sections and safe working areas, we will need some weekend lane closures and diversions over the coming months to let us safely complete work in the hard-to-reach areas around junction 25, and on the southbound exit slip road.
During most of this upcoming weekend work, the A12 will remain open to traffic but there may be some changes to the road layout around junction 25. While this work has been carefully planned and sequenced to minimise disruption and reduce the impact on the local road network, there may be some diversions and additional congestion in the area, so please allow more time for your journeys.
At the end of our weekend work later this summer, we’ll need one full weekend road closure between the junction 25 southbound exit slip road and junction 25 southbound entry slip road while we work on the road underneath the Marks Tey junction.
To minimise disruption, we’ve grouped together all the remaining work which will need road closures. These will all be done in one single weekend towards the end of this project. While we understand closures can be disruptive, we’re planning to make these changes as quickly as possible, and with the least possible disruption.
When is this work happening?
A list of our upcoming work is listed in the table below:
Dates of closure
Closure details
Diversion Route
Ongoing until no later than 24 May
Full closure (24/7) of the A12 southbound entry slip road at junction 26 Stanway
Traffic will join the A12 northbound at J26 Stanway and travel to junction 27, and re-join the A12 southbound at junction 27 entry slip road.
10-13 May
17 - 20 May
31 May - 3 June
07 - 10 June
21 - 24 June
Between 8pm each Friday evening and 6am each Monday morning
We’ll be doing weekend work in hard-to-reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past junction 25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction 25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
24 June - 19 July
Full closure (24/7) of the southbound exit slip road at junction 25 Marks Tey for approx. four weeks while we reconstruct the surface within the slip road carriageway.
Traffic will continue along the A12 southbound to junction 24and re-join the A12 northbound via the J24 northbound entry slip road.
19 - 22 July
26 - 29 July
09 - 12 August
Between 8pm each Friday evening and 6am each Monday morning
We’ll be undertaking some work in hard-to -reach areas on the A12 southbound carriageway.
During this time, the A12 southbound will remain open to traffic but with some changes to the road layout around junction 25 Marks Tey.
The southbound contraflow lane will remain open as normal. We advise motorists wanting to continue on the A12 southbound past J25 Marks Tey to use this lane.
Traffic travelling in the inside lane will be diverted off of the A12 at junction25 southbound exit slip road. Customers in this lane that wish to continue travelling southbound along the A12, will be diverted up and over the junction, rejoining the A12 via the junction 25 southbound entry slip road.
16 - 19 August
Between 8pm on 16 August and 6am on 19 August
Full closure of the A12 carriageway between junction 25 southbound exit slip road, and junction 25 entry slip road.
All A12 southbound traffic will be diverted up and over junction 25, exiting the southbound carriageway via the southbound exit slip road, and re-joining the A12 southbound the other side of the junction via the junction 25 southbound entry slip road.
The map below shows the changes to the road layout during upcoming weekend works around junction 25. Please note:
- A12 southbound contraflow lane will remain open as usual.
- Customers in the inside lane that wish to continue travelling southbound along the A12, will be diverted up and over junction 25 Marks Tey, rejoining the A12 via the junction 25 southbound entry slip road.
During our closures, we urge customers to:
- plan ahead
- avoid unnecessary travel
- follow the diversion routes and signage in place and not sat navs
- allow more time for your journey when travelling in the area
We always aim to work to programme, however unforeseen circumstances or adverse weather conditions may mean changes.
We thank all customers and local residents for their patience while we carry out this important work.
Keep in touch
If you have any questions about this work, you can contact us by calling our 24/7 Customer Contact Centre on 0300 123 5000, or by emailing info@nationalhighways.co.uk.
You can also keep up to date on road closures by visiting our Traffic England website at www.trafficengland.com or by following our X feed: @HighwaysEAST.
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07 May 2024
Urgent southbound closure for surfacing and barrier work
Ahead of our weekend work around junction 25 starting this weekend (10 May), we need to put an urgent closure in place this week to replace some of the road surface and move the barrier within the southbound carriageway.
To do this work safely, we need to close the A12 southbound between junction 26 Stanway and junction 25 Marks Tey for two nights starting from tomorrow (8 May).
Date of closure
Closure details
Diversion route
Wednesday 8 May and Thursday 9 May for 2 nights between 9pm and 5am
Closure of A12 southbound between J26 Stanway and J25 Marks Tey
Traffic will exit at Junction 26 Stanway and travel long the A1124, London Road and re-join the A12 at Junction 25 Marks Tey entry slip road
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02 April 2024
April road closures
Following our work on the northbound carriageway, we've been focused on the southbound section. This has included excavating lanes 2 and 3 of the southbound carriageway, starting at junction 26 and making our way south towards junction 25.
What's happening next?
To progress the project, we’ll be having a series of overnight closures on the A12 southbound between junction 26 and junction 25 while we make changes to our roadworks.
After that, we will begin to upgrade the slip roads, starting with a temporary full closure of the southbound entry slip road at junction 26, which will be closed from 20 April for approximately four weeks, allowing us to work safely in this area.
When is this work happening?
The A12 will be closed southbound overnight between junction 26 Stanway and junction 25 Marks Tey from 8pm until 6am each night on the dates listed in the table below:
Dates of closure
Closure details
Diversion Route
Monday 15 April to Friday 19 April 2024
Full closure of the A12 southbound carriageway between J26 Stanway and J25 Marks Tey
Traffic will exit at J26 Stanway and travel long the A1124, London Road and re-join the A12 at J25 Marks Tey entry slip road
Sunday 21 April to Friday 26 April 2024
Full closure of the A12 southbound carriageway between J26 Stanway and J25 Marks Tey
Traffic will exit at J26 Stanway and travel long the A1124, London Road and re-join the A12 at J25 Marks Tey entry slip road
Saturday 20 April to Saturday 18 May 2024
Full closure of the A12 southbound entry slip road at J26 Stanway
Traffic will join the A12 northbound at J26 Stanway and travel to J27, and re-join the A12 southbound at J27 entry slip road
Please note, dates are weather dependent and subject to change if we’re unable to work in poor conditions.
Whilst we understand closures can be disruptive, we will be looking to make these changes as quickly as possible and with the least possible disruption. However, during this period, please allow more time for your journey when travelling in the area.
During these closures, a clearly signed diversion route will be in place.
Traffic will exit at Junction 26 Stanway and travel along the A1124, London Road, and then re-join the A12 at Junction 25 Marks Tey entry slip road. See map below.
Progress to date
We have recycled the old concrete road surface by reusing the material (with cement) to form the new foundations we’re installing. We’ve also installed new kerbs and drains.
Once we have reconstructed the southbound carriageway, we’ll then begin applying the finished surface layer to both the northbound and southbound carriageways. We apply the final layer at this stage to ensure it isn’t damaged during the construction phase. This also maximises the life of the road surface and ensures a better quality of finish.
Once complete, this important work will extend the life of the road, improve safety, and create smoother, quieter journeys.
We’d like to thank all customers and local residents for their patience whilst we carry out this important work.
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09 February 2024
February road closures
We’ll be closing the southbound A12 carriageway between junctions 26 and 25 to carry out work in order to change the traffic management layout to allow us to access different parts of the project.
The road will close overnight from 8pm until 6am on the following dates:
Date of closure
Closure details
Diversion Route
Wednesday 14 February
Thursday 15 February
Friday 16 February
Full closure of the A12 southbound carriageway between Junction 26 Stanway and Junction 25 at Marks Tey
Traffic will exit at Junction 26 Stanway and travel long the A1124, London Road and re-join the A12 at Junction 25 Marks Tey entry slip road
During the closures, clearly signed diversion routes will be in place.
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31 January 2024
Emergency road closure due to incident
Due to a vehicle incident today, we’ve had to close the southbound carriageway at junction 26 on the A12 on 31 January to carry out emergency repairs.
This closure will be in place until 5am on 1 February.
Date of closures
Closure details
Diversion routes
Wednesday 31 January to 6am on Thursday 1 February
Full closure of the A12 southbound carriageway through junction 26 Stanway
Traffic will leave the A12 via the exit at J26 Stanway and re-join via the junction 26 entry slip road
Once we’ve completed this repair, we’ll open the carriageway again.
We’d like to thank all our customers and local residents for their patience whilst we carry out this emergency work.
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08 January 2024
Emergency closure for barrier repair
Following an incident involving a vehicle hitting our barrier over the weekend, we will need to put an emergency closure in place tonight, so we can carry out repair work.
In order for us to complete this work and keep members of the public and staff safe, there will be a requirement to close the A12 southbound, between the junction 26 Stanway exit and entry slip roads, between 9pm and 5am tonight.
Date of closure
Closure details
Diversion route
Monday 8 January
Closure of the A12 southbound between J26 exit and entry slip roads
Traffic will take the J26 Stanway exit slip road, take the second exit on the roundabout onto the J26 entry slip road, to then re-join the A12 southbound carriageway and continue journey.
Diversion route
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11 December 2023
Upcoming closures and diversions - December 2023
Our planned construction activity will stop from Thursday 21 December, with work beginning again on Wednesday 3 January 2024. This is so that we don't cause disruption to motorists travelling over the festive period.
We’ll still have workers on site to carry out any emergency repairs or maintenance work and our recovery team will be on hand to provide assistance, should anyone breakdown within the work area.
Before our construction site shuts down over the festive season, we will need some road closures to refresh road markings, install cat’s eyes, repair some of the carriageway and remove some barrier.
In order for us to complete this work and keep members of the public and our workers safe, we need to close the A12 between 9pm and 5am on the following dates:
Date of closure
Closure details
Diversion route
Thursday 14 December
Closure of the A12 southbound carriageway between J26 Stanway and J25 Marks Tey
Traffic will exit at J26 Stanway and travel along the A1124, B1408 and re-join the A12 at J25 Marks Tey
Thursday 14 December
Closure of the J27 Lexden southbound entry slip road
Traffic wanting to join the A12 southbound will take Cymbeline Way, B1408 and join the A12 southbound at J25 Marks Tey entry slip
Monday 18 December
Closure of the A12 northbound carriageway between J25 Marks Tey and J26 Stanway
Traffic will exit at J25 Marks Tey and travel along B1408, A1124 and re-join the A12 at J26 Stanway
Monday 18 December
Lane closure of the southbound contraflow lane between J26 Stanway and J25 Marks Tey
Lane 1 southbound between J26 Stanway and J25 Marks Tey will remain open
No planned closures
Diversion routes
Diversion route for A12 southbound between J26 and J25 closures
Diversion route for A12 southbound J27 Lexden entry slip road closures
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Diversion route A12 northbound between J25 Marks Tey and J26 Stanway closures
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09 December 2023
Change of open for traffic date
Since starting construction we’ve encountered a number of unexpected challenges which have impacted our timelines. As a result of this, we’ll need to continue our work on the A12 between junction 25 Marks Tey and junction 26 Stanway into summer 2024.
These challenges include adverse weather conditions, including the wettest March on record, and the discovery of poor ground conditions under the northbound carriageway.
Before we started construction, we carried out extensive industry standard surveys. Unfortunately, while our surveys were completed to current standards and using the correct methods, they can only give us an indication of the ground condition in the specific areas tested, rather than every inch of the road. This means that it was only when we began digging up the northbound carriageway that we uncovered these issues, and it became clear that additional work was required to strengthen the foundations of the road.
We know this will be frustrating news and we’re sorry for the inconvenience these delays may cause to your journey. It’s important however that our work is carried out to the highest specification now to minimise long term disruption for road users in the future.
Please be assured that we’re working hard to complete construction as quickly as possible. By building in additional time to account for these issues and the risk of further impact from anticipated poor weather conditions over the winter, we hope that this update provides transparency so you’re able to plan ahead should our work continue past spring 2024 as previously expected.
We’d like to thank you for your continued patience while we carry out this important work.
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24 November 2023
Carriageway surface
Further to our recent notification that the northbound reconstruction is complete, we’d like to confirm that a final asphalt surface will be laid towards the end of the project, to provide a smooth, consistent surface across all lanes northbound and southbound. This will mean that the surface is brand new when all of the traffic management is removed. Until then, traffic will continue to drive on the temporary surface, known as the ‘binder course’, which will eventually form the under layer of the road when the final surfacing is added.
During this time, road users may notice some bumps or ridges, but rest assured that these will be eliminated once the final surface is laid, and any safety issues such as potholes will continue to be repaired until then.
Upcoming overnight road closures for barrier installation and signage change
To finish installing the safety barrier, so we can complete the southbound carriageway work, we’ll need a couple of overnight southbound closures to put this in place.
To keep our workers safe while they do this, we’ll be closing the A12 southbound between junction 26 Stanway and junction 25 Marks Tey on the following dates:
Date and time of closure Closure details Diversion route Saturday 25 and Sunday 26 November Overnight closure of the A12 southbound between junction 26 Stanway and junction 25 Marks Tey. Traffic travelling along the A12 southbound will exit at junction 26 Stanway and travel along A1124, B1408 and re-join the A12 at junction 25 Marks Tey. Friday 8 December Overnight closure of the junction 27 southbound entry slip. Traffic wanting to join the A12 at junction 27 will take Cymbeline Way, B1408 and join the A12 at junction 25 Marks Tey. Junction 26 – 25 southbound diversion route
Junction 27 southbound entry slip diversion route
We’re sorry for the delays and disruption that our road closures cause to your journey and we encourage drivers to plan ahead and allow extra time when travelling.
Please note these closures are subject to change at short notice due to unforeseen circumstances and poor weather conditions.
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10 November 2023
Northbound carriageway work now complete
We’d like to inform you that we have now completed our work on the A12 northbound carriageway between junction 25 and 26.
Despite the challenges we’ve faced with the wettest March on record and the unexpected ground conditions we found beneath the carriageway, which meant the excavations and installation of the new foundations took longer than expected, we’ve now achieved the milestone of completing the latest phase.
We have fully excavated the carriageway, removed the concrete foundations and rebuilt the road using the recycled concrete from the old road before adding the final surface. On top of this, we’ve replaced all of the kerbs, road markings and cat’s eyes, as well as upgrading the drainage system and replacing safety barriers.
We’d like to extend our sincere thanks to all customers, local residents, in particular those living on the diversion route, and businesses for their patience whilst we’ve carried out the northbound carriageway work.
Emergency lane closure for barrier replacement
There will be an emergency lane closure of the A12 northbound at junction 25 Marks Tey tonight, to allow for some barrier to be replaced.
The A12 northbound carriageway will have 1 lane closed overnight from 9pm to 5am:
Date and time of closure Closure details Diversion route Friday 10 November Overnight closure of the A12 northbound at junction 25 Marks Tey
Traffic will exit the A12 at junction 25 travel over the roundabout and on to the junction 25 entry slip to re-join the A12 A12 J25 Northbound Up and Over Diversion Route
Upcoming closures for barrier installation
In order to create a safe working space for our staff to begin the reconstruction of the southbound carriageway, we’ll need a number of closures to install the barrier that will separate them from the live traffic.
We’ll need to close the A12 carriageway overnight. Please see the table below for more information.
The A12 southbound carriageway will be closed overnight from 9pm to 5am each night:
Date and time of closure Closure details Diversion route Monday 13 and Tuesday 14 November
and
Saturday 18 to Tuesday 21 NovemberFull closure of the A12 southbound between J29 Ardleigh Crown Interchange and J25 Marks Tey Traffic will exit at J29 Ardleigh Crown Interchange and travel along A1232, A133, B1408 and re-join the A12 southbound at J25 Marks Tey entry slip Monday 13 and Tuesday 14 November
and
Saturday 18 to Tuesday 21 November
Full closure of the J27 southbound entry slip road Traffic wanting to join the A12 southbound will take Cymbeline Way, B1408 and join the A12 southbound at J25 Marks Tey entry slip We are also working collaboratively with the maintenance team and sharing our closures, to minimise the amount of time we have to have to A12 closed.
More information about their work can be found here: https://nationalhighways.co.uk/our-roads/east/a12-maintenance-works-between-junction-25-and-junction-32/
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01 November 2023
Upcoming overnight road closures
In order for us to finish the northbound carriageway work, install the new contraflow lanes, so that we can begin work on the A12 southbound and for other maintenance work taking place along the A12, we’ll have the following closures in place between 9pm and 5am each night:
Date of closures Closure details Diversion routes Wednesday 1 to Sunday 5 November Full closure of the A12 northbound carriageway between J25 Marks Tey and J27 Lexden Traffic will exit at J25 Marks Tey and travel along B1408, A133, A1232 and re-join the A12 at J29 Ardleigh Crown Interchange Monday 6 November Full closure of the A12 southbound between J29 Ardleigh Crown Interchange and J25 Marks Tey Traffic will exit at J29 Ardleigh Crown Interchange and travel along A1232, A133, B1408 and re-join the A12 southbound at J25 Marks Tey entry slip Monday 6 to Wednesday 8 November Full closure of the A12 northbound carriageway between the J25 Marks Tey exit and entry slip roads Traffic will exit the A12 at J25 exit slip, travel over the roundabout and on to the J25 entry slip road to re-join the A12 northbound Tuesday 7 to Sunday 12 November Full closure of the A12 southbound carriageway between J26 Stanway and J25 Marks Tey Traffic will exit at J26 Stanway and travel along the A1124, B1408 and re-join the A12 at J25 Marks Tey Tuesday 7 to Sunday 12 November Full closure of the J27 southbound entry slip road Traffic wanting to join the A12 southbound will take Cymbeline Way, B1408 and join the A12 southbound at J25 Marks Tey entry slip We are utilising our closures to also allow other teams to carry out maintenance work along the A12. More information about their work can be found on the scheme webpage for the A12 maintenance works between junction 25 and junction 32.
New contraflow layout
A contraflow is when the road is shut in one direction and traffic is moved over to drive on the opposite side of the road to share the remaining carriageway.
Once the contraflow has been moved, two lanes will remain open in each direction. Lane 1 and 2 northbound will carry northbound traffic, while southbound traffic will use lane 1 southbound and lane 3 northbound, in contraflow. This new layout will provide our workers with a clear area to allow us to safely complete our work on lanes 2 and 3 of the southbound carriageway.
We now expect traffic will begin using the southbound contraflow, from Monday 6 November onwards.
We’d like to thank all our customers and local residents for their patience whilst we carry out this work.
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20 October 2023
Changes to planned October overnight road closures
Due to the heavy rain we’ve had and are expecting in the area over the coming days, we are having to change the dates for some of our planned road closures that will allow us to begin work on the southbound carriageway.
Please find the updated closures and diversion information in the table below. The road will be closed between 9pm and 5am on each of the following nights:
Date of closures
Closure details
Diversion routes
Friday 20, Sunday 22 and Friday 27 October 2023
and
Sunday 29 October to Sunday 5 November 2023
Full closure of the A12 northbound carriageway between J25 Marks Tey and J26 Stanway
Traffic will exit at J25 Marks Tey and travel along B1408, A1124 and re-join the A12 at J26 Stanway
Monday 6 November 2023
Full closure of the A12 southbound between J29 Ardleigh Crown Interchange and J25 Marks Tey
Traffic will exit at J29 Ardleigh Crown Interchange and travel along A1232, A133, B1408 and re-join the A12 southbound at J25 Marks Tey entry slip
Saturday 28 October 2023
and
Tuesday 7 to Sunday 12 November 2023
Full closure of the A12 southbound carriageway between J26 Stanway and J25 Marks Tey
Traffic will exit at J26 Stanway and travel along the A1124, B1408 and re-join the A12 at J25 Marks Tey
Saturday 28 October 2023
and
Tuesday 7 to Sunday 12 November 2023
Full closure of the J27 southbound entry slip road
Traffic wanting to join the A12 southbound will take Cymbeline Way, B1408 and join the A12 southbound at J25 Marks Tey entry slip
New contraflow layout
A contraflow is when the road is shut in one direction and traffic is moved over to drive on the opposite side of the road to share the remaining carriageway.
Once the contraflow has been moved, two lanes will remain open in each direction. Lane 1 and 2 northbound will carry northbound traffic, while southbound traffic will use lane 1 southbound and lane 3 northbound, in contraflow. This new layout will provide our workers with a clear area to allow us to safely complete our work on lanes 2 and 3 of the southbound carriageway.
We now expect traffic will begin using the southbound contraflow, from Saturday 4 November 2023 onwards.
We’d like to thank all our customers and local residents for their patience whilst we carry out this work.
Diversion route for overnight closures of A12 northbound between J25 and J26
Diversion route for overnight closures of A12 northbound between J19 and J26
Diversion route for overnight closures of A12 southbound between J26 and J25
Diversion route for overnight closures of A12 southbound between J29 and J25
We’d like to thank all customers and local residents for their patience whilst we carry out these works.
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25 September 2023
Weekend closure of the A12 northbound between junction 25 Marks Tey and junction 26 Stanway
We recently postponed our planned full weekend closure of the northbound A12 between junction 25 Marks Tey and junction 26 Stanway, as there were emergency repairs taking place in the same area.
This work has been rescheduled and will take place between 9pm Friday 6 to 5am Monday 9 October.
Please see the table below for more information:
Date of weekend closure Closure details Diversion route 9pm Friday 6 to 5am Monday 9 October Full closure of the A12 northbound carriageway between J25 Marks Tey and J26 Stanway Traffic will exit at J25 Marks Tey and travel along B1408, A1124 and re-join the A12 at J26 Stanway We can only do these works when the northbound carriageway is completely closed. This is due to the location and the time it takes for the new foundations and road surface to dry.
Please note this closure is subject to change at short notice due to unforeseen circumstances and poor weather conditions. The southbound carriageway will remain open throughout this period.
Customers should plan ahead and allow extra time when travelling and avoid the area if possible, as we expect severe delays. Please check the scheme webpage for the latest information before you travel. We’re sorry for the disruption this may cause to your journey.
Diversion route for overnight closures of A12 northbound between J25 and J26
We’d like to thank all customers and local residents for their patience whilst we carry out these works.
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20 September 2023
Overnight closures
So we can excavate concrete, lay new road foundations, replace safety barriers, carry out surveys and resurface the carriageway, we’ll be closing the A12 between junctions 25 and 27 overnight from 9pm until 5am on the dates listed below.
Date of closure Closure details Diversion Route Monday 25 September and Friday 29 & Saturday 30 September Full closure of the A12 southbound carriageway between J26 Stanway and J25 Marks Tey Traffic will exit at J26 Stanway and travel long the A1124, London Road and re-join the A12 at J25 Marks Tey entry slip Monday 25 September and Friday 29 & Saturday 30 September Full closure of the A12 southbound J27 Lexden entry slip Traffic wanting to join the A12 southbound will take Cymbeline Way, London Road and join the A12 southbound at J25 Marks Tey entry slip Wednesday 27 & Thursday 28 September and Monday 2 to Thursday 5 October Full closure of the A12 northbound carriageway between J25 Marks Tey and J26 Stanway Traffic will exit at J25 Marks Tey and travel along London Road, A1124 and re-join the A12 at J26 Stanway Friday 29 & Saturday 30 September Full closure of the A12 northbound carriageway between the J25 exit and entry slip roads Traffic will exit the A12 at J25 Marks Tey exit slip, travel over the roundabout and on to the J25 entry slip road to re-join the A12 northbound Diversion route for closure of the A12 southbound between J26 Stanway and J25 Marks Tey
Diversion route for closure of the A12 southbound J27 Lexden entry slip
Diversion route for overnight closures of A12 northbound between J25 Marks Tey and J26 Stanway
Diversion route for closure of the A12 northbound at junction 25 Marks Tey -
13 September 2023
Postponement of A12 northbound weekend closure
Due to recently identified safety issues with the carriageway on other parts of our road network (affecting the A12 Marks Tey to Stanway scheme and diversion) which require urgent repair, we are postponing the full weekend closure that was planned to take place from Friday 22 to Monday 25 September. As these repairs are safety critical due to road surface deterioration, they have taken priority.
Urgent carriageway repairs will now take place from 9pm to 5am each night from Saturday 23 to Tuesday 26 September on the A12 northbound between junction 22 and junction 24.
The planned weekend work will be rescheduled and we’ll update this webpage once the new closure dates are confirmed. We apologise for any inconvenience this change may cause you.
Public information event
As we are now well into the construction phase of our project, we’re hosting a public information event to allow customers to learn more about the work we’re completing, our progress so far and upcoming work. This is also a chance to meet members of the project team, who will be happy to answer any questions you may have.
As part of our ongoing information sharing with local residents, businesses and stakeholders, we’d like to invite you to attend our public information event that will be taking place at Marks Tey Farmer’s Market on Saturday 30 September, 9am to 1pm, at Mark Tey Parish Hall, Old London Road, Mark Tey, Colchester, CO6 1EJ.
The hall is adjacent to the interchange of the A12 and A120 and is easily accessible by car, with free parking available on site. The market is just a few minutes’ walk from Marks Tey Railway Station, where bus links to Colchester, Braintree and surrounding villages can also be found.
This event will be attended by representatives from and working on behalf of National Highways in the project team, who will be available to discuss any queries you may have.
Overnight closures
We’ll be closing the A12 carriageway to carryout concrete excavations, lay new road foundations, replace safety barriers, carry out surveys and surface the carriageway overnight from 9pm until 5am on the dates listed below.
Date of closure
Closure details
Diversion Route
Monday 11 to Friday 15 September
Full closure of the A12 northbound carriageway between the J25 exit and entry slip roads
Traffic will exit the A12 at J25 exit slip, travel over the roundabout and on to the J25 entry slip road to re-join the A12 northbound
Monday 25 to Friday 29 September
Full closure of the A12 northbound carriageway between J25 Marks Tey and J26 Stanway
Traffic will exit at J25 Marks Tey and travel along B1408, A1124 and re-join the A12 at J26 Stanway
Other work taking place in the area
Maintenance work is taking place between junction 25 Marks Tey and junction 29 Ardleigh Crown Interchange, to replace safety barriers and signs. The work will take place between 9pm and 5am on the following nights.
Monday 18 to Friday 22 September 2023
Full road closure of the A12 northbound carriageway between J25 Marks Tey and J29 Ardleigh Crown Interchange.
Diversion
Traffic will exit at J25 Marks Tey and travel along B1408, A133, A1232 and re-join the A12 northbound at J29 Ardleigh Crown Interchange entry slip.
Further information about the work can be found on our dedicated maintenance webpage.
Please note these closures are subject to change at short notice due to unforeseen circumstances and poor weather conditions. We’re sorry for the disruption this work may cause to your journey and encourage drivers to plan ahead and allow extra time when travelling, as we expect long delays over the weekend closures. Please check the webpages for the latest information before you travel. During these closures, clearly signed diversion routes will be in place.
We’d like to thank all customers and local residents for their patience whilst we carry out these works.
Diversion routes
Diversion route for overnight closures of A12 northbound between J25 Marks Tey and J26 Stanway
Diversion route for closure of the A12 northbound at junction 25 Marks Tey
Diversion route for closure of the A12 southbound between J26 Stanway and J25 Marks Tey
Diversion route for closure of the A12 southbound J27 Lexden entry slip
Diversion route for closure of the A12 northbound J25 Marks Tey and J29 Ardleigh Crown Interchange
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31 May 2023
May 2023 newsletter
A12 junction 25 Marks Tey to junction 26 Stanway - May 2023 newsletter
Today we've published the second edition of our scheme newsletter. In this issue we provide an update on the work we’ve recently completed, what we’re doing next and explain what a “contraflow” is.
Read our May 2023 newsletter now.
Overnight road closures
Over the coming weeks, we’ll be breaking out the old concrete road foundations and surfacing on the A12 northbound carriageway from junction 25 to Turkey Cock Lane.
Due to the potential for debris landing on the carriageway, this work will be carried out at night to ensure the safety of both our workers and all road users.
We’re sorry for the disruption that this may cause to your journey and we encourage drivers to plan ahead and allow extra time when travelling. Please note these closures are subject to change at short notice due to unforeseen circumstances and poor weather conditions. Please check this webpage for the latest information before you travel.
Upcoming overnight closures
The following sections of the A12 northbound carriageway will be closed overnight from 9pm to 5am on the nights listed below:
Date of closure Closure details Diversion route Wednesday 31 May to Friday 2 June
and
Monday 5 June to Friday 9 June
Full closure of the A12 J25 Marks Tey northbound entry slip road
Traffic wishing to join the A12 northbound will travel along B1408, A1124 and re-join the A12 at J26 Stanway. Full closure of the A12 northbound carriageway between J25 Marks Tey and J26 Stanway
Traffic will exit at J25 Marks Tey and travel along B1408, A1124 and re-join the A12 at J26 Stanway. During these closures, clearly signed diversion routes will be in place. Please see below for more information.
Diversion route for overnight closure of A12 northbound between J19 and J26
Diversion route for overnight closure of the A12 J25 northbound entry slip road
Diversion route for overnight closures of A12 northbound between J25 and J26
Project information
We'll be reconstructing the A12 between Marks Tey and Stanway (between junctions 25 and 26) with work starting on 17 October 2022. Reconstruction will involve completely removing the concrete road surface and some of the foundations, before rebuilding the road and resurfacing it with asphalt.
The East region has the highest concentration of concrete roads on our road network, including the A14, A12, A120, A11 and M11.
Around half of the old-style concrete roads will either have repairs or will be replaced during the next five years.
We’ll be using innovative new ways of working and new technology to provide a modern road that will last for decades to come. This will also make it easier and quicker for us to carry out repairs in the future.
Find out more about our nationwide Concrete Roads work
Why we need the scheme
The surface of concrete roads that were designed between the 1950s and 1970s have an average life span of 50 years. Their surfaces are now reaching the stage where they will need to be repaired or replaced for safety reasons, and to help them be less noisy and better to drive on.
In late 2020, we made repairs to the A12 road surface between junction 22 and junction 24 in both directions. During early 2021, we resurfaced the A12 southbound main carriageway between junctions 27 to 26 and also repaired the road surface at the slip roads at junction 27. And in late 2021, we completed repairs to the A12 between junctions 15 and 19.
This video explains the process we go through to rebuild concrete roads:
There is more reconstruction, resurfacing and other maintenance work scheduled for 2023 on other stretches of this road. Read about how we're rebuilding and replacing some of the old concrete road surface on the A12
We started our work to reconstruct the road in Autumn 2022, and we expect to finish by late 2023/early 2024, subject to weather conditions.
We are using a ‘contraflow’ system to keep everyone safe and the road open whilst we’re working. A contraflow is when the road is shut in one direction and traffic is then moved over to drive on the other side of the road to share the remaining road space. This provides us with a clear working area, which means we can work more quickly and safely.
By using a contraflow, we’ll be able to keep two lanes of traffic in each direction whilst we do our work. Full road closures are only be needed when we set up and take down our roadworks.
We'll be doing the work in a few phases:
Phase one: will start at junction 25 northbound and head up to junction 26. Our construction workers will be in lanes one and two, with traffic in a contraflow.
Phase two: junction 25 northbound heading up to junction 26. Our construction workers will be in lanes two and three with traffic in a contraflow.
Phase three: junction 26 southbound heading to junction 25. Our construction workers will be in lanes one and two with traffic in a contraflow.
Phase four: junction 26 southbound heading to junction 25. Our construction workers will be in lanes two and three.
Due to the nature of the work, some noise and light disturbance is expected, but we’ll aim to keep this to a minimum. Thank you for your patience whilst we do this important road work.
When complete, the scheme will:
- improve safety and provide a smoother rider for road users
- reduce noise levels
- create a new modern road with a 40 to 50-year lifespan that’ll be easier and quicker for us to repair in future
We’ve set up a free SMS alerts service to warn road users, via text message, of any incidents that occur within our roadworks on the A12 during peak travel times.
You can sign up for this service by sending your mobile number to: ConcreteRoadsEssex@nationalhighways.co.uk. Please reference the ‘A12 Marks Tey to Stanway SMS service’ in the subject line of your email, so it's clear which scheme updates you'd like to register for.
Please note that you can opt out at any time by contacting us at the same email address.
Read the latest news and progress on our project to rebuild the A12 road in this stretch.
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