A three-car traffic collision has been causing delays on the M40 northbound between junctions nine and 10.
There was heavy traffic after ambulance crews were called to the accident about 2pm, and the road is now clear.
A spokeswoman said: "We had an ambulance crew and an ambulance officer on the scene.
"They were assessing three patients.
"Two were treated at the scene and a third was taken to the Horton Hospital.”