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A man died when the car he was driving struck the crash barrier on the A21 near Sevenoaks.
Police were called to the scene close to the Morleys roundabout at 11.20pm Sunday, however a spokesman said the last sighting of the victim was at 8.30pm so the exact time of the crash is unclear.
The victim - a man in his 30s from south east London - was travelling alone in a silver BMW 320.
He was pronounced dead at the scene and no other vehicles were involved.
The London-bound stretch of the A21 was closed between Tonbridge and Morleys roundabout until 5.30am Monday.
Anyone with information is urged to contact Kent Police's Serious Collision Investigation Unit on 01622 798538.