A motorhome caught fire on the A34 northbound between the Peartree interchange and Kidlington Junction this morning.
One lane was blocked on the A34 northbound.
Oxfordshire Fire and Rescue service said it was called at 11.16am to the scene.
Spokesman Paul Smith added: "Two appliances attended – one from Kidlington and one from Bicester.
"It was a fire due to a mechanical defect."
He said the crews were not on the scene for very long at that it was not serious.
A Thames Valley Police spokeswoman added that no one was hurt in the incident.
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