One lane of the M40 northbound is closed this morning after a car overturned.
One lane of the motorway northbound is shut between junction five for Stokenchurch and junction six at Watlington.
It's a mild but wet start with temperatures of 8C and roads across the county are very wet.
Drivers are being warned to take extra care as there is a lot of surface water on the road on major routes including the M40, A34 and A40.
It is not yet known if anyone has been injured in the M40 accident.
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