The M25 remains closed anticlockwise after a crash between a motorcyclist and a lorry earlier this morning.
Emergency services were called to the motorway just before 7am following the crash which happened between junction 18 for Chorleywood and junction 17 for Maple Cross.
FOLLOW LIVE UPDATES ON M25 CRASH HERE
Both carriageways were clsed bdtween the two junctions earlier to allow an air ambulance to land.
Investigation work is ongoing meaning anticlockwise stays shut.
Hertfordshire Constabulary says one person has been arrested on suspicion of dangerous driving.
Long delays remain in the Watford and Rickmansworth areas.
FOLLOW LIVE UPDATES ON M25 CRASH HERE
There are long tailbacks back to junction 21 for the M1 and clockwise from the M40.
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