Live incidentLane closureNational Highways
M4 eastbound lane closure between J4 and J3, live incident, started Sat 10 Oct, 15:40
- Road
- M4
- Direction
- Eastbound
- Junctions
- J4 to J3
- Started
- Sat 10 Oct, 15:40
- Category
- Incident
M4 westbound lane closure at J4B, 12 Sep 2026
Cleared
This incident on the M4 has cleared. It started at 01:38 on Sat 12 Sep and cleared at 01:45 on Sat 12 Sep.
Last updated by National Highways at 01:45 on Saturday 12 September 2026.
Closure details and map
- Status
- Cleared
- Closure type
- Lane closure
- Category
- Incident
- Road
- M4
- Direction
- Westbound
- Junctions
- J4B
- Location
- M4 westbound within J4B
- Started
- 01:38 on Saturday 12 September 2026
- Cleared
- 01:45 on Saturday 12 September 2026
- Source
- National Highways
- Last updated by the source
- 01:45 on Saturday 12 September 2026
Map of the M4 westbound lane closure at J4B
Use the arrow keys to move the map and the plus and minus keys to zoom.
- Cleared
Other M4 closures and crash records
4 other closures are in force on the M4 right now, and 66 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 eastbound lane closure between J20 and J19, live incident, started Sat 10 Oct, 14:38
- Road
- M4
- Direction
- Eastbound
- Junctions
- J20 to J19
- Started
- Sat 10 Oct, 14:38
- Category
- Incident
- 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
- Active roadworksHard shoulder closureNational Highways
M4 eastbound hard shoulder closure between J17 and J16, active roadworks, started Tue 27 Apr 2021, 23:59
- Road
- M4
- Direction
- Eastbound
- Junctions
- J17 to J16
- Started
- Tue 27 Apr 2021, 23:59
- Expected to clear
- Fri 30 Jul 2027, 18:00
- Category
- Road Maintenance
- PlannedHard shoulder closureNational Highways
M4 eastbound hard shoulder closure between J19 and J18, planned, starts Sat 10 Oct, 20:00
- Road
- M4
- Direction
- Eastbound
- Junctions
- J19 to J18
- Starts
- Sat 10 Oct, 20:00
- Expected to clear
- Sun 11 Oct, 06:00
- Category
- Road Maintenance
- PlannedRoad closureTraffic Wales
M4 eastbound road closure from J28 Tredegar Park to J24 Coldra, planned, starts Sun 11 Oct, 20:00
- Road
- M4
- Direction
- Eastbound
- Junctions
- J28 to J24
- Area
- J28 Tredegar Park to J24 Coldra
- Starts
- Sun 11 Oct, 20:00
- Expected to clear
- Sat 17 Oct, 06:00
- Category
- Clearance Work