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The A20 near Hollingbourne was closed after a two-car collision.
The incident happened at just after 4.45pm, at the roundabout close to the M20 Junction 8 (Leeds) on Saturday.
The road was shut eastbound while fire crews used hydraulic cutting equipment to cut the roof off and free a woman from her vehicle. She was taken to hospital.
The scene was cleared by 5.30pm.