The Highways Agency is unable to give a latest date for the completion of roadworks on the A12.
However it is now likely to be completed sometime in May.
Resurfacing work is currently taking place along 10 miles of the road between the A14 and the M25, with much of it between Copdock and Stratford St Mary.
A speed restriction of 40mph enforced by average speed cameras is in place between junctions 33 and 31 (Copdock and Stratford St Mary respectively) on both carriageways.
While most of the work takes place at night the speed limit is in force constantly because of temporary road surfaces and parts of safety barriers being removed.
The work started at the end of 2014 and was scheduled to take four months, but the agency did say the completion date was likely to be some time in May.
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