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.
Final phase of works starts October 2026
We’re starting the final phase of our resurfacing work on sections of Old London Road and refreshing the road markings.
Closures and diversions
Thursday 8 October (9pm-5am) - A12 northbound between junctions 19 and 25
We need to close this section because Old London Road can be accessed from the A12 at several points. The full closure will prevent vehicles from entering our work area and help keep road users and our workforce safe.
A12 northbound diversion
Northbound traffic will:
- leave the A12 at junction 19
- join the A131
- continue to the A120
- follow the A120 and re-join the A12 at junction 25
Clearly signed diversion routes will be in place throughout the closure.
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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