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Drivers were advised to find an alternative route after a crash on the Dartford Crossing bridge.
Police were called to the scene of the south-bound accident, which blocked two lanes out of four.
Traffic was queueing between Junction 31 and Junction J1A of the M25.
Kent Police have tweeted: “We are currently at the scene of a collision which has happened on the Dartford Crossing bridge.
“There may be significant delays to traffic heading from Essex and into Kent on the #M25 and if possible motorists are advised to avoid the area and choose alternate routes.”
All lanes reopened just before 8pm, but the traffic took some time to clear.
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