Traffic continues to build up as traffic officers attend the scene of the collision.
The crash happened between Junction 24 for Potters Bar and Junction 25 for Cheshunt on the M25.
Traffic was been stopped in the anti-clockwise direction at the Hertfordshire stretch of the motorway.
Traffic was then allowed to pass on just one lane of the carriageway.
Highways England warned motorists of the delays, providing a later update on the flow of traffic and remaining congestion.
“However 3 lanes (of 4) remain closed at this time.
“There’s just over a mile of congestion on approach, but this is likely to increase quickly.”
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