Police have closed the road between Devizes and Beckhampton this evening after a crash involving a car and a van near the turn off to Bishops Cannings.
Fire, ambulance and police are at the scene of the accident on the dual carriageway. Traffic is being diverted towards Calne over the downs near North Wiltshire Golf Club.
Traffic is at a standstill on the diversion as rush hour motorists try to get home.
A road traffic report said: "A361 Wiltshire - A361 London Road closed in both directions between the Horton Avenue junction in Bishops Cannings and the A4361 Beckhampton Road junction in Beckhampton, because of an accident involving a car and a van."
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