From National Highways:
M4 junction 18 roundabout to A46 Cold Ashton roundabout
Overnight closures (18 November – 20 November 2024)
We’ll soon be carrying out general maintenance works, such as drainage, sign repairs, sweeping and inspections, between the M4 J18 roundabout and the A46 Cold Ashton roundabout.
This will maintain safety and improve journeys, while preventing the need for unplanned closures.
We’ll carry out this work weeknights between 8pm and 6am only, when there is less traffic on the road, starting from the evening of Monday 18 November. It will take us up to two nights to complete the works.
During the day the road will be open as usual.
Closure information
From Monday 18 November, for two nights, the carriageway between the M4 J18 roundabout and the A46 Cold Ashton roundabout, will be closed overnight (8pm to 6am).
Diversion information and access
Well signed diversion routes will be in place, in both directions.
Diversion route (non-LGV traffic)
Southbound diversion is to:
- travel north of A46.
- turn right onto Norley Lane,
- turn right onto Marshfield Road
- turn right onto the A420 to Cold Ashton roundabout
Northbound diverted traffic to follow in reverse.
Diversion route (LGVs)
For southbound LGV traffic:
- follow M4 eastbound to J17
- go south on A350
- turn right onto the A420 and follow to Cold Ashton roundabout
Northbound diverted traffic to follow in reverse.