Four-vehicle smash blocks motorway at Watford

Four-vehicle crash blocks motorway near Watford

A four-vehicle collision has caused the closure of the anti-clockwise M25 near Watford, resulting in delays of up to an hour. The incident has led to the motorway being closed within Junction 20 (A41 interchange).

Traffic is being diverted around the crash site, with National Highways reporting delays of approximately 50 minutes as of 8:30pm. Congestion was initially reported to stretch about five miles at 8pm and now extends back to the M1.

“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.”

Herts Police and the East of England Ambulance Service are at the scene. Traffic is diverted via the exit and entry slip roads to leave and rejoin at Junction 20, causing delays of around 30 minutes on the approach and three miles of congestion.

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The #M25 anti-clockwise is closed within J20 near #Watford due to a 4 vehicle collision. @roadpoliceBCH + an Ambulance are on scene. Traffic is diverted via the exit/entry slip roads, to leave/rejoin at J20. Delays of 30 minutes on the approach, 3 miles of congestion.

National Highways: East (@HighwaysEAST), November 9, 2025

Author's summary: A multi-vehicle crash near Watford has closed the M25 anti-clockwise at Junction 20, causing long delays and significant traffic congestion with emergency services actively managing the scene.

Would you like me to simplify the language further or keep it formal?

Watford Observer — 2025-11-09

Four-vehicle crash blocks motorway near Watford

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