M4 overnight closures at J12

Published: 18 January 2023

In order to carry out concrete inspection and survey work, National Highways has scheduled the following overnight motorway and lane closures. There will be eastbound and westbound closures at different times.

Eastbound closures:

• The M4 will be closed underneath the junction from 9.00pm on Monday 23 January to 6.00am on Tuesday 24 January. Traffic will be diverted up and over junction 12.
• Lane 1 will be closed from 9.00am on Tuesday 24 January to 6.00am on Wednesday 25 January. Traffic will still be able to travel along the motorway, and exit and enter at the junction.

Westbound closures:

• The M4 will be closed underneath junction 12 from 9.00pm on Wednesday 25 January to 6.00am on Thursday 26 January. Traffic will be diverted up and over the junction.
• Lane 1 will be closed underneath the junction from 9.00pm on Thursday 26 January to 6.00am on Friday 27 January. Traffic will still be able to travel through and to exit and enter at the junction.

For further information and updates, please see the National Highways web site