A12 Margaretting Bypass

We are rebuilding the A12 Margaretting Bypass. This will improve the safety, create a smoother quieter journey and extend the life of the road to make it fit for the future.

Start date Autumn 2022
End date

Latest updates

Project information


We will be reconstructing the A12 Margaretting Bypass (between junctions 13 and 15) later this autumn. Reconstruction will involve completely removing the concrete road surface and some of the foundations, before rebuilding the road and resurfacing it with asphalt.

The East region has the highest concentration of concrete roads on our road network, including the A14, A12, A120 and M11.

Around half of the old-style concrete roads will either have repairs or will be replaced during the next five years.

We’ll be using new ways of working and new technology to provide a modern road that will last for decades to come. This will also make it easier and quicker for us to carry out repairs in the future.

To find out more about our nationwide Concrete Roads work please visit our programme page.

Why we need the scheme

The surface of concrete roads that were designed between the 1950s and 1970s have an average life span of 50 years. Their surfaces are now reaching the stage where they will need to be repaired or replaced for safety reasons, and to help them be less noisy and better to drive on.

In late 2020, we made repairs to the A12 road surface between junction 22 and junction 24 in both directions. During early 2021, we resurfaced the A12 southbound main carriageway between junctions 27 to 26 and also repaired the road surface at the slip roads at junction 27. And in late 2021, we completed repairs to the A12 between junctions 15 and 19, and there is more resurfacing and other maintenance work scheduled for during 2022 on other stretches of this road.

Traffic management

We’re currently planning to use a contraflow system during construction of the scheme. This means work will be focused on one carriageway at a time. While the contraflow is in place the carriageway will be reduced to two lanes both northbound and southbound. Putting a contraflow system in place will help us to keep the A12 open for the majority of the work, so that road users will continue to be able to use it. This will minimise the disruption to local communities and road users, limit the need for road closures and diversions and allow the work to take place safely.

What happens next?

We’re finalising the design of the scheme and look forward to meeting with the local community to show those plans at our Public Information Exhibitions, which are planned to take place in August 2022.

When complete, the scheme will:

  • improve safety and provide a smoother rider for road users
  • reduce noise levels
  • create a new modern road with a 40 to 50-year lifespan that’ll be easier and quicker for us to repair in future


Traffic information

Information about scheduled roadworks and events on our motorways and major roads.

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