What happened
The M25 in Hertfordshire is closed clockwise between J21a (St Albans) and J22 (London Colney) due to a large off network fire.
RoadM25
SeveritySevere
StatusCleared
DirectionBoth directions
Started10:32, 11 Aug 2026
Cleared13:20, 11 Aug 2026
Incident timeline
First report
The M25 in Hertfordshire is closed clockwise between J21a (St Albans) and J22 (London Colney) due to a large off network fire.
Update
The M25 in Hertfordshire is closed clockwise between J21a (St Albans) and J22 (London Colney) due to a large off network fire.
Update
⏱ Still active — no changes from National Highways. Incident ongoing for 47 minutes. Delays of 60 minutes still recorded. Monitoring continues.
Update
The M25 in Hertfordshire is closed clockwise between J21a (St Albans) and J22 (London Colney) due to a large off network fire.
Update
⏱ Still active — no changes from National Highways. Incident ongoing for 1h 22m. Delays of 60 minutes still recorded. Monitoring continues.
Update
The M25 in Hertfordshire is closed clockwise between J21a (St Albans) and J22 (London Colney) due to a large off network fire.
Update
⏱ Still active — no changes from National Highways. Incident ongoing for 1h 57m. Delays of 60 minutes still recorded. Monitoring continues.
Update
The M25 in Hertfordshire is closed clockwise between J21a (St Albans) and J22 (London Colney) due to a large off network fire.
Update
⏱ Still active — no changes from National Highways. Incident ongoing for 2h 32m. Delays of 60 minutes still recorded. Monitoring continues.
Update
The M25 in Hertfordshire is closed clockwise between J21a (St Albans) and J22 (London Colney) due to a large off network fire.
Update
✅ Incident cleared — M25 reopened at 13:20 on 11 Aug 2026. Total disruption: 2h 47m. All lanes open, traffic returning to normal.
Final update
The M25 in Hertfordshire is closed clockwise between J21a (St Albans) and J22 (London Colney) due to a large off network fire.
Wording from National Highways, recorded as it changed.
UK Traffic Updates