M4 closed J20–J21 westbound

Road closure on the M4 westbound at J20–J21 on Friday 23 October 2026, from 12:44. Still reported at 15:17 UK time. Timeline of reports from TomTom and National Highways.

Status

Live since 12:44 (2 h 33 min)

Location

M4 westbound · J20–J21

Reported as

Road closed

Lanes

Road closed

At its worst

Stationary traffic · delay ~21 min

Sources

TomTom · National Highways ×3

Timeline

1. 12:44 TomTom: queueing traffic, “Slow traffic”, delay ~4 min
2. 12:57 TomTom: “Queuing traffic”
3. 13:25 TomTom: “Stationary traffic”
4. 14:12 National Highways: road closed
5. 14:44 National Highways: road closed
6. 14:53 TomTom no longer reports it

Source reports

• Stationary traffic
• M4 westbound between J20 and J21

Other recent incidents on the M4

• M4 crash J8–J10 westboundyesterday 15:23 · cleared after 2 h 46 min
• M4 crash J4B–J5 westboundyesterday 09:55 · cleared after 4 h 33 min
• M4 stopped traffic J20–J21yesterday 07:02 · cleared after 51 min
• M4 crash J35 westboundWed 22:53 · cleared after 1 h 25 min
• M4 closed J20–J21 westboundWed 20:45 · cleared after 6 h 52 min
• M4 crash J10–J8 eastboundWed 13:16 · cleared after 36 min
• M4 crash J18Wed 07:27 · cleared after 23 min
• M4 crash J19–J20 westboundWed 06:54 · cleared after 2 h 33 min
• M4 closed J20–J21 westboundTue 21:17 · cleared after 7 h 26 min
• M4 crash J6–J5 eastboundTue 14:41 · cleared after 1 h 42 min

The sources don't report causes or injuries, so neither does this page. Times are UK time. For alerts, follow @motorways.me on Bluesky.