Officers are now appealing for witnesses following a collision involving a car and a motorcycle on the A272 in Easebourne on Tuesday (June 6).
The incident happened at the Cowdray Park Golf Club junction at around 6.55pm.
Emergency services attended and a road closure was in place until about 11pm.
The motorcycle rider – a man in their 30s from Crawley – was taken to hospital with serious injuries.
Officers are particularly looking to identify a white car that may have been behind the car involved in the collision.
Anyone with any information or relevant dashcam footage is asked to report to police online or via 101 quoting 1409 of 06/06.