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A crash involving several vehicles led to long queues of traffic over the Dartford Crossing.
The incident was reported shortly after 7.30am on the clockwise stretch of the M25 over the QEII Bridge.
Three lanes have been closed after two cars and a lorry were involved.
Delays were building from the scene of the crash at junction 1a for the A206 Bob Dunn Way.
The entry slip road joining the M25 from the junction was closed, according to the Traffic England website run by Highways England.
Queues had been tailing back into Essex with slow moving traffic beyond junction 30 for the A13 and Lakeside and jams building up towards junction 29.
Highways England warned of 50 minute delays due to three of the four lanes being closed.
But the road reopened at about 9am and delays had cleared by 10.30am.
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