M1 crash J21A–J21 southbound

Crash on the M1 southbound at J21A–J21 on Sunday 27 September 2026, from 17:52. Cleared at 18:32 after 40 min. Timeline of reports from the motorway signs and TomTom.

Status

Cleared 18:32 on 27 Sept 2026, after 40 min

Location

M1 southbound · J21A–J21

Reported as

Collision

At its worst

Delay ~6 min

Sources

Motorway signs · TomTom

Timeline

1. Sun 17:52 Motorway signs: “COLLISION SLOW DOWN”
2. Sun 18:05 TomTom: queueing traffic, “Queuing traffic”, delay ~6 min
3. Sun 18:19 TomTom no longer reports it
4. Sun 18:23 TomTom: queueing traffic, “Slow traffic”, delay ~3 min (reported again)
5. Sun 18:28 TomTom no longer reports it
6. Sun 18:32 Motorway signs no longer show “COLLISION SLOW DOWN”
7. Sun 18:32 All clear: no source reports it any more

Source reports

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

Other recent incidents on the M1

• M1 stopped traffic J36–J37 northbound13:45 · Live
• M1 crash J11 northbound11:03 · cleared after 1 h 49 min
• M1 crash J24A northbound07:14 · cleared after 27 min
• M1 crash J16–J17 northbound06:39 · cleared after 40 min
• M1 crash J11–J11A northbound06:11 · cleared after 4 h 41 min
• M1 crash J6A–J8 northboundyesterday 22:39 · cleared after 39 min
• M1 reported crash J23A northboundyesterday 19:28 · cleared after 49 min
• M1 stopped traffic J16–J17 northboundyesterday 19:28 · cleared after 5 h 51 min
• M1 crash J21A–J21 southboundyesterday 18:50 · cleared after 1 h 19 min
• M1 crash J23–J22 southboundyesterday 16:59 · cleared after 51 min

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

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