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Drivers were warned to steer clear of the Thanet Way after one lane of the coast-bound carriageway was blocked due to an accident in Goodnestone.
The two-car crash happened on the Thanet Way between J7 for Brenley Corner and Graveney Road.
One person was injured and witnesses reported a van alight and heavy tailbacks.
Police eported queues for several miles back along the M2, but said traffic on the other side of the Thanet Way was not affected.