M25 crash J21–J20 anticlockwise

Crash on the M25 anticlockwise at J21–J20 on Friday 16 October 2026, from 16:12. Cleared at 19:24 after 3 h 12 min. Timeline of reports from TomTom and the motorway signs.

Status

Cleared 19:24 on 16 Oct 2026, after 3 h 12 min

Location

M25 anticlockwise · J21–J20

Reported as

Collision

At its worst

Delay ~14 min

Sources

TomTom ×4 · Motorway signs ×2

Timeline

1. 16:12 TomTom: queueing traffic, “Slow traffic”, delay ~3 min
2. 16:35 TomTom no longer reports it
3. 16:35 All clear: no source reports it any more
4. 16:48 TomTom: queueing traffic, “Slow traffic”, delay ~3 min (reported again)
5. 16:53 TomTom no longer reports it
6. 16:53 All clear: no source reports it any more
7. 17:11 TomTom: queueing traffic, “Slow traffic”, delay ~3 min (reported again)
8. 17:16 TomTom: queueing traffic, “Queuing traffic”, delay ~5 min
9. 17:30 TomTom: queueing traffic, “Queuing traffic”, delay ~6 min (reported again)
10. 17:43 TomTom: “Stationary traffic”
11. 17:45 Motorway signs: “OBSTRUCTION ON SLIP ROAD”
12. 17:48 TomTom: “Queuing traffic”
13. 17:58 TomTom: queueing traffic, “Slow traffic”, delay ~9 min
14. 18:02 TomTom: delay now ~14 min (was ~9), “Queuing traffic”
15. 18:06 TomTom: “Stationary traffic”
16. 18:20 TomTom: delay now ~8 min (was ~13), “Queuing traffic”
17. 18:24 Motorway signs no longer show “OBSTRUCTION ON SLIP ROAD”
18. 18:34 TomTom: “Slow traffic”
19. 18:39 Motorway signs: “COLLISION SLOW DOWN”
20. 18:43 TomTom no longer reports it
21. 18:43 All clear: no source reports it any more
22. 18:48 TomTom: queueing traffic, “Queuing traffic”, delay ~6 min
23. 18:57 TomTom no longer reports it
24. 19:24 Motorway signs no longer show “COLLISION SLOW DOWN”
25. 19:24 All clear: no source reports it any more

Source reports

• Slow traffic
• Queuing traffic
• Overhead signs read “OBSTRUCTION ON SLIP ROAD” (3 signs; furthest along: M25 anti-clockwise between J21 and J20).
• Overhead signs read “COLLISION SLOW DOWN” (2 signs; furthest along: M25 anti-clockwise between J21 and J20).

Other recent incidents on the M25

• M25 crash J7 clockwise18:41 · Live
• M25 stopped traffic J9–J10 clockwise15:35 · cleared after 2 h 55 min
• M25 stopped traffic J29–J30 clockwise14:59 · cleared after 3 h 30 min
• M25 delays J25–J26 clockwise14:26 · Live
• M25 stopped traffic J1512:26 · cleared after 7 h 32 min
• M25 crash J24–J23 anticlockwise12:17 · cleared after 3 h 4 min
• M25 crash J23–J22 anticlockwise10:40 · cleared after 30 min
• M25 crash J10 clockwise10:40 · cleared after 9 h 27 min
• M25 reported crash J21–J20 anticlockwise10:33 · cleared after 48 min
• M25 crash J3007:14 · cleared after 1 h 59 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.