A multi-vehicle crash closed two lanes of the M25.
Two out of four lanes were closed early on Tuesday, heading anti-clockwise between junction 28 at Brentwood and junction 27 for Epping and the M11.
Both lanes have reopened, but drivers have been warned of residual delays of more than 90 minutes and eight miles of congestion.
National Highways urged people to allow extra time for their journeys.
