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Motorists are stuck in long queues on two major routes following an earlier broken-down vehicle near the Dartford Crossing.
Traffic is being building on the M25 anticlockwise and the A2 on the London-bound carriageway from Gravesend to Bexleyheath.
The vehicle broke down near junction 1a on the M25 for the Dartford Crossing, causing congestion to junction 3 for the Swanley Interchange.
It is understood one of the tunnels was temporarily closed.
There are also 40-minute delays on the A2 near Bluewater Shopping Centre.
Listen to kmfm for regular traffic updates.