Miles of congestion near Potters Bar after crash.

There is a large amount of congestion following a collision on the M25. Picture: www.motorwaycameras

There is a large amount of congestion following a collision on the M25. Picture: www.motorwaycameras.co.uk - Credit: www.motorwaycameras.co.uk

There is currently 3.5 miles of congestion near Potters Bar on the M25 Anticlockwise.

Lane 4 is closed between Junction 24 and Junction 23 following an accident.