M4 Tidmarsh Road Pier Refurbishment

Concrete repair to Centre Bridge Pier and upgrade to Vehicle Restraint Barrier.

Start date 26 February 2021
End date 25 August 2021
Cost TBC

Latest updates

  • 16 July 2021

    Overnight closures - 24/25 July

    To allow the team to replace several missing road studs through the narrow lane traffic management, the M4 between junctions 12 and 13 will be closed overnight (9pm to 6am) as follows:

    • Saturday 24 July – M4 WESTBOUND from junction 12 to junction 13
    • Sunday 25 July – M4 EASTBOUND from junction 13 to junction 12

    During the closures, a signed diversion will be in place via the A4.

Project information


We’re carrying out concrete repairs to the Tidmarsh Road bridge which spans the M4, and upgrading the safety barrier which protects vehicles from impacting the bridge.

To allow us to carry out the repair to the centre pier of the bridge, narrow lanes and a 50mph speed limit are in place on the M4 between junctions 12 and 13 in both directions. Free breakdown recovery is available.

Ensuring structural integrity and upgraded safety barrier.


Traffic information

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

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