Three lanes had to be shut on the M25 during rush hour following a crash.
The crash happened in lane three and four on the anticlockwise junction from junction 19 to junction 18 for the A404.
Congestion is back to junction 20 for Kings Langley.
Three lanes were shut, although traffic has now been released and the crash has been moved to the hard shoulder.
Police and East of England Ambulance Service are at the scene.
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