M4 westbound closures junctions 12 to 13

Published: 04 September 2025

National Highways will be resurfacing the M4 westbound carriageway between junction 12 Theale and junction 13 Chieveley. 

To carry out the work safely, the carriageway will be closed from junction 12 to 13, including the slip road at junction 12, overnight (9.00pm to 6.00am) from Monday 8 September to Friday 10 October.  

The westbound entry slip road at junction 12 will also be closed from 9.00pm on Friday 3 October to 6.00am on Sunday 5 October to allow materials to cure.  

There will be a diversion via the A4 from Theale to Newbury, and A34 back to junction 13.