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All the emergency services have been called out after a crash involving several vehicles.
All three lanes that were earlier closed have now reopened, but traffic is still reported as very slow.
It comes after a couple of vans, a car and a bike were in a crash on the London-bound carriageway of the A2 near the Tollgate services at Gravesend.
The accident, near the Wrotham Road turn-off, happened just before 7.20am, and only lane four of four is open.
Congestion is said to stretch back to J1 of the M2 at Strood.