Morgan Sindall will begin work on Monday 27th February for National Highways replacing the pavement of the A12 Margaretting Bypass.
Preparation work has already begun with the installation of speed cameras, CCTV and temporary barriers by Tetra Tech.
The work forms part of a drive to replace or repair ageing concrete roads across the country.
The latest section of the A12 to be worked on is between the Trueloves Interchange (junction 13) and the Webbs Farms Interchange (junction 15). Morgan Sindall is also working on the eight-mile stretch of the A12 between Marks Tey (junction 25) and Stanway (junction 26), replacing concrete with asphalt.
The southbound carriageway between Spring Lane Interchange (junction 27) and Eight Ash Green (junction 26) was rebuilt in 2021. And the stretch between Colemans Interchange (junction 22) and Kelvedon (junction 24) was resurfaced in 2020.
National Highways programme delivery manager Karl Brooks said: “The A12 is one of the region’s most important roads and carries 80,000 vehicles each day helping to connect London with Suffolk. It’s a vital route and, as anyone regularly travelling on the road will know, it needs to be upgraded. Our work will futureproof this important route for years to come.”