Live incidentLane closureNational Highways
M4 westbound lane closure between J6 and J7, live incident, started Sun 4 Oct, 23:25
- Road
- M4
- Direction
- Westbound
- Junctions
- J6 to J7
- Started
- Sun 4 Oct, 23:25
- Category
- Incident
M4 westbound lane closure at J20, 11 Mar 2026
Cleared
This incident on the M4 has cleared. It started at 10:38 on 11 Mar 2026 and cleared at 10:49 on 11 Mar 2026.
Last updated by National Highways at 10:49 on Wednesday 11 March 2026.
Closure details and map
- Status
- Cleared
- Closure type
- Lane closure
- Category
- Incident
- Road
- M4
- Direction
- Westbound
- Junctions
- J20
- Location
- M4 westbound within J20
- Started
- 10:38 on Wednesday 11 March 2026
- Cleared
- 10:49 on Wednesday 11 March 2026
- Source
- National Highways
- Last updated by the source
- 10:49 on Wednesday 11 March 2026
Map of the M4 westbound lane closure at J20
Use the arrow keys to move the map and the plus and minus keys to zoom.
- Cleared
Other M4 closures and crash records
8 other closures are in force on the M4 right now, and 57 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.
- Live incidentLane closureNational Highways
M4 westbound lane closure between J7 and J8, live incident, started Sun 4 Oct, 23:25
- Road
- M4
- Direction
- Westbound
- Junctions
- J7 to J8
- Started
- Sun 4 Oct, 23:25
- Category
- Incident
- Active roadworksSlip road closureNational Highways
M4 eastbound slip road closure at J15, active roadworks, started Sun 4 Oct, 22:30
- Road
- M4
- Direction
- Eastbound
- Junctions
- J15
- Started
- Sun 4 Oct, 22:30
- Expected to clear
- Mon 5 Oct, 05:30
- Category
- Road Maintenance
- Active roadworksCarriageway closureNational Highways
M4 eastbound carriageway closure between J23 and J22, active roadworks, started Sun 4 Oct, 20:51
- Road
- M4
- Direction
- Eastbound
- Junctions
- J23 to J22
- Started
- Sun 4 Oct, 20:51
- Expected to clear
- Mon 5 Oct, 06:00
- Category
- Road Maintenance
- Active roadworksLane closureNational Highways
M4 eastbound lane closure between J19 and J18, active roadworks, started Sun 4 Oct, 20:43
- Road
- M4
- Direction
- Eastbound
- Junctions
- J19 to J18
- Started
- Sun 4 Oct, 20:43
- Expected to clear
- Mon 5 Oct, 06:00
- Category
- Road Maintenance
- Active roadworksExit slip road closureTraffic Wales
M4 eastbound exit slip road closure at J35 Pencoed, active roadworks, started Tue 15 Sep, 19:00
- Road
- M4
- Direction
- Eastbound
- Junctions
- J35
- Area
- J35 Pencoed
- Started
- Tue 15 Sep, 19:00
- Expected to clear
- Fri 9 Oct, 06:00
- Category
- Clearance Work