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Highways teams were forced to hold up traffic due to an overturned vehicle on the approach to the Dartford Crossing.
Congestion on the M25 stretches back to junction 3 for the Swanley Interchange following the accident.
Emergency services are in attendance.
Teams have righted the vehicle and moved it from the carriageway.
Kent Police wad called to the incident ad 8.05am and said no serious injuries were reported.
All lanes were reopened by 8.35am.