M1 stopped traffic J21 northbound

Stopped traffic on the M1 northbound at J21 on Wednesday 28 October 2026, from 18:52. Cleared at 19:53 after 1 h 1 min. Timeline of reports from TomTom and the motorway signs.

Status

Cleared 19:53 on 28 Oct 2026, after 1 h 1 min

Location

M1 northbound · J21

Reported as

Incident

At its worst

Stationary traffic · delay ~67 min

Sources

TomTom · Motorway signs

Timeline

1. Wed 18:52 TomTom: queueing traffic, “Stationary traffic”, delay ~50 min
2. Wed 18:57 TomTom: delay now ~67 min (was ~50)
3. Wed 19:07 TomTom: delay now ~33 min (was ~50)
4. Wed 19:12 TomTom: delay now ~19 min (was ~33)
5. Wed 19:14 Motorway signs: “INCIDENT SLOW DOWN”
6. Wed 19:17 TomTom no longer reports it
7. Wed 19:17 All clear: no source reports it any more
8. Wed 19:53 Motorway signs no longer show “INCIDENT SLOW DOWN”
9. Wed 19:53 All clear: no source reports it any more

Source reports

• Stationary traffic
• Overhead signs read “INCIDENT SLOW DOWN” (1 sign; furthest along: link road from M25 J21 to M1 J6A northbound).

Other recent incidents on the M1

• M1 crash J42–J43 northboundyesterday 22:32 · cleared after 1 h 21 min
• M1 crash J43–J42 southboundyesterday 20:39 · cleared after 1 h 44 min
• M1 crash J9–J10 northboundyesterday 19:33 · cleared after 49 min
• M1 crash J17–J16 southboundyesterday 15:34 · cleared after 47 min
• M1 crash J34 northboundyesterday 15:09 · cleared after 42 min
• M1 crash J22–J23 northboundyesterday 14:46 · cleared after 47 min
• M1 crash J20–J21 northboundyesterday 12:30 · cleared after 2 h 51 min
• M1 crash J37–J36 southboundyesterday 08:35 · cleared after 44 min
• M1 stopped traffic J32–J33 northboundyesterday 07:33 · cleared after 1 h 16 min
• M1 crash J8–J9 northboundyesterday 06:00 · cleared after 3 h 31 min

Live traffic and past incidents at 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.