Police are appealing for witnesses after a Porsche driver was left in a critical condition following an accident on the A34 at Weston-on-the-Green on Thursday morning.
A Porsche Carrera and a Mercedes Sprinter van collided on the southbound carriageway at about 7.30am.
The driver of the Porsche was airlifted to the John Radcliffe Hospital in Oxford with suspected head injuries. His condition is described as critical.
The driver of the Mercedes was taken to John Radcliffe Hospital with minor injuries.
Anyone with information about the incident, please contact PC James Holstead via the Thames Valley Police Enquiry Centre on 101.