Live incidentLane closureNational Highways
M4 eastbound lane closure between J10 and J8, live incident, started Mon 5 Oct, 08:47
- Road
- M4
- Direction
- Eastbound
- Junctions
- J10 to J8
- Started
- Mon 5 Oct, 08:47
- Category
- Incident
M4 westbound slip road closure at J20, 21 Feb 2026
Cleared
This incident on the M4 has cleared. It started at 21:07 on 21 Feb 2026 and cleared at 21:33 on 21 Feb 2026.
Last updated by National Highways at 21:33 on Saturday 21 February 2026.
Closure details and map
- Status
- Cleared
- Closure type
- Slip road closure
- Category
- Incident
- Road
- M4
- Direction
- Westbound
- Junctions
- J20
- Location
- link road from M4 westbound J20 to M5 J15
- Started
- 21:07 on Saturday 21 February 2026
- Cleared
- 21:33 on Saturday 21 February 2026
- Source
- National Highways
- Last updated by the source
- 21:33 on Saturday 21 February 2026
Map of the M4 westbound slip road 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 60 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 J10 and J8, live incident, started Mon 5 Oct, 08:26
- Road
- M4
- Direction
- Eastbound
- Junctions
- J10 to J8
- Started
- Mon 5 Oct, 08:26
- Category
- Incident
- Live incidentExit slip road closureTraffic Wales
M4 westbound exit slip road closure at J33 Capel Llanilltern, live incident, started Mon 5 Oct, 07:51
- Road
- M4
- Direction
- Westbound
- Junctions
- J33
- Area
- J33 Capel Llanilltern
- Started
- Mon 5 Oct, 07:51
- Expected to clear
- Mon 5 Oct, 09:51
- Category
- Congestion
- Live incidentExit slip road closureTraffic Wales
M4 eastbound exit slip road closure at J33 Capel Llanilltern, live incident, started Mon 5 Oct, 07:34
- Road
- M4
- Direction
- Eastbound
- Junctions
- J33
- Area
- J33 Capel Llanilltern
- Started
- Mon 5 Oct, 07:34
- Expected to clear
- Mon 5 Oct, 11:34
- Category
- Congestion
- Live incidentCongestionTraffic Wales
M4 eastbound congestion from J26 Malpas to J23A Magor, live incident, started Mon 5 Oct, 07:07
- Road
- M4
- Direction
- Eastbound
- Junctions
- J26 to J23A
- Area
- J26 Malpas to J23A Magor
- Started
- Mon 5 Oct, 07:07
- Expected to clear
- Mon 5 Oct, 10:06
- Category
- Congestion
- 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