The project, between junctions 31 and 33 (Four Sisters and Copdock) of the A12, involves resurfacing the road, renewing road signs, repairing drainage and upgrading safety barriers. Work on the project started in December and was originally scheduled to finish at the end of March.
It is one of two similar improvement schemes currently underway on the A12 between Essex and Ipswich. In all, 10 miles of the A12 are being upgraded.
Highways England Service Delivery Team Leader Aran Nugent, said:
I appreciate this will be frustrating news for drivers, but I’d ask them to bear with us while we complete this important work. By taking the extra time now and completing the job to a high standard, we can reduce the likelihood of future repairs.
The work has taken longer than we anticipated because of various operational issues which has slowed down how quickly we can complete the work.
Our contractors have had issues with the plant, which supplies the materials, and we also postponed work over the Bank Holiday to help drivers setting off for the half-term break.
Most of the work, including the speed limit, will be removed by mid-June after this there will be finishing off work using lane closures only.
The work is dependent on suitable weather conditions, and dates may be subject to further change.
Members of the public should contact the Highways England customer contact centre on 0300 123 5000.
Journalists should contact the Highways England press office on 0844 693 1448 and use the menu to speak to the most appropriate press officer.