A 21-year-old man remains in intensive care after his car collided with a parked Landcruiser near Bude on Sunday.
Police are appealing for witnesses to the crash which occurred on the B3254, near to the junction of the A3072, at around 11.35am.
Officers said the Honda Civic was involved in a collision with an unattended Toyota Landcruiser, which was parked in a layby at Launcells.
The driver of the Honda, the only occupant of the vehicle, sustained serious head and chest injuries and was flown to Derriford Hospital in Plymouth by air ambulance. The man, who is from Launceston, remains in intensive care.
A specialist forensic investigation of the scene was conducted by police and the road was closed for around six hours.
Officers from the Force Serious Collisions Investigation Unit are now appealing for witnesses to the incident.
Anyone with information is asked to contact police on 101, quoting log number 329 of 02/12/12.