Both vehicles sustained substantial damage and the occupants of both cars, three people in total , were left with life-threatening injuries and remain in hospital.
The third vehicle involved had minor damage and the occupant was not injured.
We ask that any witnesses to the collision or people who stopped at the scene to assist come forward and help us with our enquiries.
Were you travelling along the A287 last night and do you have dashcam footage of the collision or any footage of the vehicles involved prior to the incident?
Anyone with information can call us on 101 and quote reference number 44210154977.