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All lanes have reopened but traffic is queueing for nine miles after a crash between a lorry and a car on the M25.
Drivers are taking around 45 minutes longer to travel between J6 for the A22 at Godstone to J5 for the A21 at Sevenoaks.
Lanes one and two were closed earlier about a mile before J6, towards Gatwick. Queues are tailing back through the two lane section at J5, and onto the M26.
They have now reopened, but delays are continuing.