A two-vehicle crash is causing delays near The Boundary House.
The incident involving a silver Citroen and a silver Fiat van happened just before 2pm today on the roundabout junction between Purton Road and Moredon Road.
Police have partially closed the road while dealing with the accident.
A Wiltshire Police spokesman said: “Officers attended to assist with traffic and are currently waiting for the vehicles to be recovered.”
There were no injuries reported, police added.