Four-Vehicle Crash Blocks M25 Near Watford
A serious collision involving four vehicles caused major disruption on the M25 near Watford, leading to delays of up to an hour. The anti-clockwise carriageway was fully closed within Junction 20, near the A41 interchange.
As of 8:30 p.m., National Highways reported delays lasting around 50 minutes, with traffic being diverted via the exit and entry slip roads at Junction 20.
The #M25 anti-clockwise is closed within J20 near #Watford due to a 4-vehicle collision. @roadpoliceBCH and an ambulance are on scene. Traffic is diverted via slip roads. Delays of 30 minutes and 3 miles of congestion.
Earlier in the evening, congestion was reported to stretch approximately five miles, extending back toward the M1. Emergency services, including Hertfordshire Police and the East of England Ambulance Service, were in attendance.
“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 ask drivers to please avoid the area at this time,” said a police spokesperson.
Traffic and Diversion Update
- All lanes closed anti-clockwise between J20 and A41 interchange.
- Traffic diverted via local slip roads for re-entry at J20.
- Delays of 30–50 minutes on approach with around 5 miles of congestion.
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Author’s summary: A multi-car collision near Watford shut the M25’s anti-clockwise lanes, causing extended traffic jams as police and ambulances managed the scene.