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Traffic was queuing after a crash involving a van and a lorry on a roundabout.
The incident was causing delays at Junction 10a in Ashford.
Officers attended along with paramedics and a man was taken to the William Harvey Hospital.
Pictures showed a van on a grass verge following the crash, which was blocking the A2070 exit for Sevington.
The roundabout sits next to the 230-acre Sevington Inland Border Facility, which has space for 1,700 lorries.
The road was cleared by 1.45pm.
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