Active roadworks
This roadworks closure on the M4 is in force now. It started at 20:00 on Mon 5 Oct and is expected to clear at 06:00 on Sat 10 Oct.
Last updated by Traffic Wales at 20:00 on Monday 5 October 2026.
Map of the M4 westbound slip road closure from J38 Margam to J39 Groes
Use the arrow keys to move the map and the plus and minus keys to zoom.
9 other closures are in force on the M4 right now, and 42 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.