Four-vehicle smash blocks motorway at Watford

Four-vehicle crash blocks M25 near Watford

A collision involving four vehicles has blocked the anti-clockwise M25 motorway near Watford, causing delays up to an hour. The closure is affecting traffic within Junction 20 (A41 interchange).

Traffic Diversions and Delays

Traffic is being diverted around the site using exit and entry slip roads at Junction 20. Congestion extends approximately five miles, reaching back to the M1 motorway. National Highways reported delays of around 50 minutes as of 8:30 PM and three miles of congestion at 8 PM.

Emergency Services Response

Herts Police and the East of England Ambulance Service are on site managing the incident. A police spokesperson stated:

[translate:«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.»]

Social Media Updates

The #M25 anti-clockwise near J20 is closed due to the crash. @roadpoliceBCH and an ambulance are on scene, with traffic diverted via the exit/entry slip roads at the junction.

Summary

The four-vehicle crash on the M25 near Watford has caused significant congestion and delays, with emergency responders actively managing the scene and advising motorists to avoid the area.

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Watford Observer Watford Observer — 2025-11-09