M4 J12 traffic

No incidents reported at M4 J12 right now.

Updated 03:27 UK time · at J12 and the stretches either side

Right now

Nothing reported at M4 J12 at the moment.

Eastbound J13–J12until 06:002 of 4 lanes closedM4 eastbound lane 1 and 2 closure (77/0 to 73/7)

No closures planned at J12 tonight.

Incidents

103

Collisions

Road closed

7times

Typical time to clear

41 minmedian of 93

Busiest time

19:00–20:00

M4 crash J12–J11 eastboundSun 04:41 · cleared after 1 h 31 min
M4 crash J11–J12 eastbound27 Oct 2026 13:03 · cleared after 46 min
M4 crash J13–J12 eastbound27 Oct 2026 08:31 · cleared after 11 h 49 min
M4 crash J11–J12 westbound24 Oct 2026 16:18 · cleared after 1 h 11 min
M4 stopped traffic J13–J12 eastbound23 Oct 2026 15:55 · cleared after 1 h 38 min
M4 stopped traffic J13–J12 eastbound20 Oct 2026 12:38 · cleared after 1 h 49 min
M4 reported crash J13–J12 eastbound20 Oct 2026 11:48 · cleared after 58 min
M4 reported crash J13–J12 eastbound20 Oct 2026 07:24 · cleared after 51 min
M4 crash J13–J12 eastbound18 Oct 2026 16:17 · cleared after 1 h 30 min
M4 crash J11–J12 westbound9 Oct 2026 15:06 · cleared after 11 h 35 min
M4 reported crash J12–J11 eastbound9 Oct 2026 06:27 · cleared after 40 min
M4 closed J12–J13 westbound6 Oct 2026 20:53 · cleared after 7 h 12 min
M4 closed J12–J13 westbound5 Oct 2026 20:18 · cleared after 7 h 48 min
M4 closed J12–J13 westbound30 Sept 2026 19:55 · cleared after 10 h 35 min
M4 closed J12–J13 westbound28 Sept 2026 22:40 · cleared after 5 h 36 min

No incidents have closed it right now.

No closures are planned at J12 tonight.

10 collisions reported at or either side of J12 in the last 90 days, the latest on 1 Nov 2026 at 04:41.

Includes incidents at J12 and on the stretches either side of it. Sources: National Highways, TomTom, TfL and Traffic Wales. Times are UK time.