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There were long queues on the A249 following a crash involving a caravan, lorry and a cement mixer.
The Maidstone-bound carriageway has now reopened, opposite Kent Showground heading towards the M20 Junction 7 roundabout, following the collision at 10am.
The car towing the caravan ended up in a ditch, down the embankment at Detling Hill.
Police and paramedics were called and drivers were warned to expect delays and allow extra time for their journeys.
Initially a lane was cordoned off, but officers temporarily closed the road while the scene was cleared. Traffic was diverted via the M2.
Anyone who witnessed the collision or the moments leading up to it is asked to contact Kent Police on 101 quoting incident ref: 29-0362.