All lanes of the M40 Northbound have now re-opened following an earlier crash.
The incident occurred between J6 at Watlington and J7 with the A40 at Thame.
South Central Ambulance Service spokesman David Gallagher said a car had struck the barrier and rolled over.
A rapid response vehicle and an ambulance were sent to the scene at 11.48am.
A woman was treated for injuries but did not need to go to hospital. Police were also in attendance.
Lane one of three was closed but has now re-opened.
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