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Three lanes were closed after a crash on the A2 west-bound at the Bean Interchange.
It caused long delays for motorists between the Bluewater turn-off and the M25 Darenth Interchange at J2.
Congestion was stretching back to the Ebbsfleet turn-off, with extra travel time estimated at 20 minutes.
The carriageway was completely blocked briefly, but lane four reopened at 11.45am.
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