Police are investigating a serious collision on the A29 Beacon Hill, Pulborough, on Tuesday (May 26).
Officers were called around 6.15pm to reports of a collision involving a white Honda CBR motorcycle and a black Seat Ibiza.
The motorcycle rider – a 27-year-old man from the Selham area – suffered serious injuries and was taken to the Royal Sussex County Hospital in Brighton.
The driver of the Seat – a 30-year-old woman from the Walberton area – was uninjured.
Police are keen to hear from anyone who witnessed the collision, who saw either vehicle being driven prior to the collision, or who may have any relevant dash cam footage.
Anyone with information is urged to contact Sussex Police by calling 101 or emailing email@example.com quoting Operation Downley.