M1 | Greater London | Carriageway Closure | Expect Delays

Incident timeline

1. 18:13, 10 JulFirst report

   The M1 in Greater London is closed northbound between J1 (Brent Cross) and J4 (Elstree) due to a serious collision involving a motorcycle.

2. 18:20, 10 JulUpdate

   The M1 in Greater London is closed northbound between J1 (Brent Cross) and J4 (Elstree) due to a serious collision involving a motorcycle.

3. 18:50, 10 JulUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 37 minutes. Monitoring continues.

4. 18:55, 10 JulUpdate

   The M1 in Greater London is closed northbound between J1 (Brent Cross) and J4 (Elstree) due to a serious collision involving a motorcycle.

5. 19:25, 10 JulUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 1h 12m. Monitoring continues.

6. 19:30, 10 JulUpdate

   The M1 in Greater London is closed northbound between J1 (Brent Cross) and J4 (Elstree) due to a serious collision involving a motorcycle.

7. 20:00, 10 JulUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 1h 47m. Monitoring continues.

8. 20:05, 10 JulUpdate

   The M1 in Greater London is closed northbound between J1 (Brent Cross) and J4 (Elstree) due to a serious collision involving a motorcycle.

9. 20:25, 10 JulUpdate

   ✅ Incident cleared — M1 reopened at 20:25 on 10 Jul 2026. Total disruption: 2h 12m. All lanes open, traffic returning to normal.

10. 20:34, 6 NovFinal update

    The M1 in Greater London is closed northbound between J1 (Brent Cross) and J4 (Elstree) due to a serious collision involving a motorcycle.

Wording from National Highways, recorded as it changed.

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