The crash was on the B4015 Clifton Hampden Road, which was closed between the A4074 and Chiselhampton Village. Thames Valley Police has confirmed the road will be closed for several hours and motorists are being told to avoid the area. READ MORE: British Eventing Horse Trials - Inquest opens after mum's tragic deathPolice said: "The B4015 Clifton Hampden Road, Oxfordshire is currently closed following a serious collision. The B4015 is closed between the A4074 and Chiselhampton Village whilst officers investigate a serious collision. "This closure is anticipated to be in place for a number of hours - please avoid the area and find an alternative route.