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M4 westbound carriageway closure between J20 and J21, 30 Sep 2026

Cleared

This incident on the M4 has cleared. It started at 19:43 on Wed 30 Sep and cleared at 05:30 on Thu 1 Oct.

Last updated by National Highways at 20:00 on Wednesday 30 September 2026.

Closure details and map

Status
Cleared
Closure type
Carriageway closure
Category
Incident
Road
M4
Direction
Westbound
Junctions
J20 to J21
Location
M4 westbound between J20 and J21
Started
19:43 on Wednesday 30 September 2026
Cleared
05:30 on Thursday 1 October 2026
Source
National Highways
Last updated by the source
20:00 on Wednesday 30 September 2026

Map of the M4 westbound carriageway closure between J20 and J21

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  • Cleared

Other M4 closures and crash records

26 other closures are in force on the M4 right now, and 41 more are planned in the next 7 days.

The M4 accident statistics from 1979 to 2025 record 29,200 collisions on the road, 724 of them fatal.

All M4 closures