Traffic is building up following a collision on a busy motorway.

Motorists are facing long delays after Dartford Tunnel was closed for an hour following an accident between junction 1 for Dartford and junction 31 for Lakeside just after 7am.

Traffic is queuing back to Gravesend on the A2 and junction 3 at Swanley on the M25 as well as one mile either side on the A206 at junction1a.

All lanes have now reopened.

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Drivers are advised to leave extra time for their journey.