Two lanes of the M25 in Hertfordshire have been closed after a multi-vehicle crash.
National Highways said it was affecting traffic on the M25 anti-clockwise between junction 17 at Rickmansworth – and junction 16 for the M40.
Emergency services and recovery vehicles are at the scene.
Drivers have been warned of delays of more than 90 minutes in the area and are advised to allow extra time for their journeys.
