M1 crash J21–J21A northbound

Crash on the M1 northbound at J21–J21A on Monday 9 November 2026, from 14:57. Cleared at 16:28 after 1 h 31 min. Timeline of reports from the motorway signs and TomTom.

Status

Cleared 16:28 on 9 Nov 2026, after 1 h 31 min

Location

M1 northbound · J21–J21A

Reported as

Collision

At its worst

Delay ~11 min

Sources

Motorway signs · TomTom

Timeline

1. 14:57 Motorway signs: “COLLISION SLOW DOWN”
2. 15:06 TomTom: queueing traffic, “Stationary traffic”, delay ~8 min
3. 15:10 TomTom: “Queuing traffic”
4. 15:15 TomTom: “Stationary traffic”
5. 15:24 TomTom: “Queuing traffic”
6. 15:29 TomTom: now says collision, “Stationary traffic, Accident”
7. 15:33 TomTom: “Queuing traffic, Accident”
8. 15:38 TomTom: now says queueing traffic, “Queuing traffic”
9. 15:42 TomTom: “Slow traffic”
10. 15:47 TomTom no longer reports it
11. 15:51 TomTom: queueing traffic, “Slow traffic”, delay ~7 min (reported again)
12. 16:01 TomTom: “Queuing traffic”
13. 16:03 Motorway signs no longer show “COLLISION SLOW DOWN”
14. 16:14 TomTom: “Slow traffic”
15. 16:28 TomTom no longer reports it
16. 16:28 All clear: no source reports it any more

Source reports

• Overhead signs read “COLLISION SLOW DOWN” (1 sign; furthest along: M1 northbound between J21 and J21A).
• Slow traffic

Other recent incidents on the M1

• M1 delays J40–J3907:28 · cleared after 1 h 36 min
• M1 crash J23A–J23 southbound06:45 · cleared after 2 h 24 min
• M1 stopped traffic J11–J1005:58 · cleared after 4 h 16 min
• M1 crash J29 northbound04:53 · cleared after 7 h 10 min
• M1 reported crash J11–J10 southboundyesterday 21:20 · cleared after 39 min
• M1 crash J11yesterday 16:37 · cleared after 41 min
• M1 crash J8–J9 northboundyesterday 16:14 · cleared after 1 h 41 min
• M1 reported crash J8–J9 northboundyesterday 16:14 · cleared after 43 min
• M1 crash J28 northboundyesterday 16:12 · cleared after 2 h 37 min
• M1 crash J16–J15A southboundyesterday 13:24 · cleared after 2 h 2 min

Live traffic and past incidents at M1 J21 and M1 J21A.

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