M4 crash J19–J20 westbound

Crash on the M4 westbound at J19–J20 on Wednesday 21 October 2026, from 06:54. Cleared at 09:26 after 2 h 33 min. Timeline of reports from TomTom and the motorway signs.

Status

Cleared 09:26 on 21 Oct 2026, after 2 h 33 min

Location

M4 westbound · J19–J20

Reported as

Collision

At its worst

Stationary traffic · delay ~27 min

Sources

TomTom ×2 · Motorway signs

Timeline

1. 06:54 Motorway signs: “REPORT OF COLLISION”
2. 07:18 TomTom: queueing traffic, “Queuing traffic”, delay ~5 min
3. 07:23 TomTom no longer reports it
4. 07:27 TomTom: queueing traffic, “Slow traffic”, delay ~9 min (reported again)
5. 07:31 TomTom: “Queuing traffic”
6. 07:45 TomTom: delay now ~20 min (was ~14), “Stationary traffic”
7. 07:49 TomTom: “Queuing traffic”
8. 07:51 Motorway signs no longer show “REPORT OF COLLISION”
9. 08:08 TomTom: “Stationary traffic”
10. 08:27 TomTom: queueing traffic, “Queuing traffic”, delay ~5 min
11. 08:50 TomTom: “Slow traffic”
12. 08:54 TomTom: “Queuing traffic”
13. 09:12 TomTom: delay now ~9 min (was ~15)
14. 09:16 TomTom: “Slow traffic”
15. 09:26 TomTom no longer reports it
16. 09:26 All clear: no source reports it any more

Source reports

• Slow traffic
• Overhead signs read “REPORT OF COLLISION” (5 signs; furthest along: M4 westbound between J19 and J20).
• Queuing traffic

Other recent incidents on the M4

• M4 crash J1807:27 · cleared after 23 min
• M4 closed J20–J21 westboundyesterday 21:17 · cleared after 7 h 26 min
• M4 crash J6–J5 eastboundyesterday 14:41 · cleared after 1 h 42 min
• M4 stopped traffic J13–J12 eastboundyesterday 12:38 · cleared after 1 h 49 min
• M4 stopped traffic J13–J12yesterday 12:04 · cleared after 28 min
• M4 crash J10 westboundyesterday 11:57 · cleared after 2 h 5 min
• M4 reported crash J13–J12 eastboundyesterday 11:48 · cleared after 58 min
• M4 reported crash J13–J12 eastboundyesterday 07:24 · cleared after 51 min
• M4 stopped traffic J20–J21yesterday 07:14 · cleared after 2 h 19 min
• M4 crash EastboundMon 18:36 · cleared after 6 h 25 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.