M4 stopped traffic J20–J21

Stopped traffic on the M4 at J20–J21 on Tuesday 20 October 2026, from 07:14. Cleared at 09:33 after 2 h 19 min. Timeline of reports from TomTom.

Status

Cleared 09:33 on 20 Oct 2026, after 2 h 19 min

Location

M4 · J20–J21

Reported as

Queueing traffic

At its worst

Stationary traffic · delay ~31 min

Sources

TomTom ×4

Timeline

1. 07:14 TomTom: queueing traffic, “Slow traffic”, delay ~4 min
2. 07:24 TomTom: queueing traffic, “Slow traffic”, delay ~3 min
3. 07:28 TomTom: delay now ~10 min (was ~3)
4. 07:37 TomTom: “Queuing traffic”
5. 07:42 TomTom: delay now ~19 min (was ~14), “Stationary traffic”
6. 07:56 TomTom: “Queuing traffic”
7. 08:05 TomTom: “Stationary traffic”
8. 08:06 TomTom: queueing traffic, “Stationary traffic”, delay ~7 min
9. 08:10 TomTom: “Queuing traffic”
10. 08:15 TomTom: delay now ~12 min (was ~7), “Stationary traffic”
11. 08:19 TomTom: queueing traffic, “Queuing traffic”, delay ~8 min
12. 08:24 TomTom: “Slow traffic”
13. 08:29 TomTom: “Queuing traffic”
14. 08:56 TomTom: “Slow traffic”
15. 09:00 TomTom: delay now ~12 min (was ~19), “Queuing traffic”
16. 09:01 TomTom: “Queuing traffic”
17. 09:33 TomTom no longer reports it
18. 09:33 All clear: no source reports it any more

Source reports

• Slow traffic
• Queuing traffic
• Stationary traffic

Other recent incidents on the M4

• M4 reported crash J13–J12 eastbound07:24 · cleared after 51 min
• M4 crash Eastboundyesterday 18:36 · cleared after 6 h 25 min
• M4 stopped traffic J14–J15yesterday 13:41 · cleared after 32 min
• M4 crash J18 eastboundyesterday 06:45 · cleared after 6 h 56 min
• M4 crash J15–J14 eastboundSun 18:24 · cleared after 1 h 36 min
• M4 stopped traffic J13–J14Sun 17:28 · cleared after 1 h 9 min
• M4 crash J13–J12 eastboundSun 16:17 · cleared after 1 h 30 min
• M4 crash J16–J17Sun 16:05 · cleared after 41 min
• M4 reported crash J15–J16 westboundSun 01:38 · cleared after 55 min
• M4 crash J4 eastboundSat 23:21 · cleared after 2 h 11 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.