An accident that saw a car overturned has left the A419 Northbound partially blocked with queueing traffic for two miles.
Read more: teenager taken to hospital after accident on A419.
Traffic was also slow on the opposite side of the road due to onlookers - affecting traffic between Swindon and Cirencester.
Traffic was being held at the top of Blunsdon Hill, which caused a large traffic jam.
A spokesman for Wiltshire Police said: "We were called at 8.30am today to an RTC between a car and motorbike.
"Ambulance and fire are on scene."
More details here: live traffic and travel
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