Live incidentLane closureNational Highways
M4 westbound lane closure between J8 and J10, live incident, started Sun 4 Oct, 21:27
- Road
- M4
- Direction
- Westbound
- Junctions
- J8 to J10
- Started
- Sun 4 Oct, 21:27
- Category
- Incident
M4 westbound lane closure between J20 and J21, 28 Sep 2026
Cleared
This incident on the M4 has cleared. It started at 04:46 on Mon 28 Sep and cleared at 05:14 on Mon 28 Sep.
Last updated by National Highways at 05:14 on Monday 28 September 2026.
Closure details and map
- Status
- Cleared
- Closure type
- Lane closure
- Category
- Incident
- Road
- M4
- Direction
- Westbound
- Junctions
- J20 to J21
- Location
- M4 westbound between J20 and J21
- Started
- 04:46 on Monday 28 September 2026
- Cleared
- 05:14 on Monday 28 September 2026
- Source
- National Highways
- Last updated by the source
- 05:14 on Monday 28 September 2026
Map of the M4 westbound lane closure between J20 and J21
Use the arrow keys to move the map and the plus and minus keys to zoom.
- Cleared
Other M4 closures and crash records
7 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.
- 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
- 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
- Tue 13 Oct, 06:00
- Category
- Clearance Work