A12 Chelmsford to Colchester maintenance
We're resurfacing and maintaining the central reservation on the A12 in Essex between junction 20b (Hatfield Peverel South) to junction 22 (Witham North), and from junction 24 (Kelvedon North) to junction 25 (Marks Tey) from 11 May to October 2026.
Planned road closures start 13 July 2026
We’re starting our main maintenance work on the A12 from Monday 13 July, resurfacing the road and refreshing the road markings between Chelmsford and Colchester.
We've a number of planned road closures, starting from 13 July until October 2026 on weeknights only, between 9pm and 5am, weather permitting.
Closures and diversions
The work will be done in three stages. To work safely, we'll need the following road closures.
Monday 13 July to Saturday 1 August - A12 northbound between junction 19 to junction 22
Monday 10 August to Friday 12 September - A12 southbound between junction 25 to junction 23
Monday 14 September to Friday 10 October - A12 northbound between junction 19 to junction 25
Diversions
If you wish to travel northbound on the A12:
- exit the A12 at junction 19 (Borham)
- onto the A131 (Beaulieu Parkway/Channels Drive)
- at the roundabout, turn right onto the A131
- continue to the A120 (Great Notley)
- then onto the A120 towards Colchester
- then join the A12 at junction 25 (Marks Tey), before continuing on your journey
If you wish to travel southbound on the A12:
- from the A120, exit at junction 25 (Marks Tey)
- follow the A120 to Great Notley
- then leave the A120 onto the A131
- at the roundabout, turn right onto the A131 and continue to junction 19
- before joining the A12 and continuing on your journey
A12 junctions 19 to 25 closure and diversion route
Please remember that closures can change at short notice. You can check the latest information on our daily closures page. Our travel alerts give details of live incidents on our network.
Project information
Documents
Traffic information
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