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M4 J20 traffic

No incidents reported at M4 J20 right now.

Updated 03:27 UK time · at J20 and the stretches either side

View on the live map All M4 traffic

Right now

Nothing reported at M4 J20 at the moment.

Roadworks now

Westbound J20until 5 DecExit slip road closed

Closures tonight

No closures planned at J20 tonight.

Long-term closures

Westbound J20until 5 Dec 2026Exit slip road closed

The last 90 days

Incidents

53

Collisions

5

Road closed

21times

Typical time to clear

2 h 17 minmedian of 50

Busiest time

20:00–21:00

Recent incidents

M4 crash J20–J21 westboundSat 08:53 · cleared after 44 min
M4 closed J19–J20 westbound27 Oct 2026 21:47 · cleared after 8 h 4 min
M4 closed J19–J20 westbound27 Oct 2026 08:46 · cleared after 12 h 48 min
M4 closed J20–J21 westbound27 Oct 2026 04:00 · cleared after 1 h 36 min
M4 reported crash J19–J20 westbound24 Oct 2026 20:09 · cleared after 1 h 21 min
M4 closed J20–J21 westbound24 Oct 2026 15:12 · cleared after 12 h 24 min
M4 closed J19–J20 westbound23 Oct 2026 14:24 · cleared after 5 h 22 min
M4 closed J20–J21 westbound23 Oct 2026 12:44 · cleared after 2 h 44 min
M4 closed J20–J21 westbound21 Oct 2026 20:45 · cleared after 6 h 52 min
M4 crash J19–J20 westbound21 Oct 2026 06:54 · cleared after 2 h 33 min
M4 closed J20–J21 westbound20 Oct 2026 21:17 · cleared after 7 h 26 min
M4 closed J19 westbound12 Oct 2026 07:57 · cleared after 4 h 56 min
M4 closed J20–J21 westbound6 Oct 2026 20:27 · cleared after 7 h 37 min
M4 closed J19–J20 westbound5 Oct 2026 20:25 · cleared after 7 h 41 min
M4 closed J20–J21 westbound5 Oct 2026 20:22 · cleared after 7 h 44 min

Junctions either side

Every M4 junction

Common questions

Is the M4 closed at junction 20 right now?

No incidents have closed it right now.

Is M4 J20 closed tonight?

No closures are planned at J20 tonight.

How many crashes have there been at M4 J20?

5 collisions reported at or either side of J20 in the last 90 days, the latest on 31 Oct 2026 at 08:53.

Includes incidents at J20 and on the stretches either side of it. Sources: National Highways, TomTom, TfL and Traffic Wales. Times are UK time.