A 22-year-old man was seriously injured in a road traffic collision on Banbury Road, Chacombe, this weekend.
The man was driving a black Range Rover Vogue when the collision took place just after midnight on Sunday morning.
For reasons yet unknown, the car left the road, colliding with two trees. The driver, who was the only person in the car at the time, was taken to John Radcliffe Hospital in Oxford with head and lower body injuries.
Officers would like to speak to anyone who may have witnessed the collision or who may have any information regarding it.
Anyone with information or who witnessed this incident is asked to call the Drivewatch Hotline on 0800 174615.