An accident has closed one lane of the A420 westbound between Oxford and Swindon.
Drivers are facing delays after the lane was closed at the junction with the A415 in Kingston Bagpuize.
Thames Valley Police spokeswoman Francine Rodrigues said officers were called to the accident at 3.30pm.
Our top stories Ms Rodrigues added that a vehicle came off the road and said no-one was hurt.
One lane of the dual carriageway remains closed while the route is being cleared.
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