Four-vehicle smash blocks motorway at Watford

Four-vehicle crash blocks M25 near Watford

A collision involving four vehicles has caused the M25 motorway near Watford to close, resulting in delays of up to an hour. The anticlockwise section is shut within Junction 20, near the A41 interchange.

Traffic impact and diversions

Traffic is being redirected around the incident site, with National Highways reporting delays of approximately 50 minutes as of 8:30 pm. Congestion stretches for about five miles, extending back to the M1 motorway.

“We are currently dealing with a high volume of traffic on the M25 anticlockwise at Junction 20 (Watford/Kings Langley) following a road traffic collision. We would ask you to please avoid the area at this time.”

— Police spokesperson

Emergency response

Herts Police and the East of England Ambulance Service are at the scene. Road police and an ambulance attended the site to manage traffic and assist those involved.

Official update from National Highways

The #M25 anticlockwise is closed within Junction 20 near Watford due to a four-vehicle collision. Traffic is diverted via exit and entry slip roads to leave and rejoin at Junction 20. Delays of 30 minutes are reported on the approach, with three miles of congestion.

Summary

The four-car collision near Watford has resulted in significant traffic disruptions on the M25, with emergency services managing the scene and advising motorists to avoid the area.

Author's summary: A multi-vehicle crash near Watford has closed part of the M25 motorway, causing severe delays and prompting police to request drivers avoid the area for safety and congestion relief.

more

Watford Observer Watford Observer — 2025-11-09