Police are appealing for witnesses after a motorbike and a car collided in Upper Shoreham Road, Shoreham.
A purple Triumph motorbike travelling east collided with a red Alfa Romeo travelling west shortly before 5pm on February 17.
The 63-year-old man on the motorbike, from Shoreham, suffered a broken rib and injuries to his chest and knee and was taken to Worthing Hospital for treatment.
The 38-year-old woman in the Alfa Romeo, from Lancing, was not injured.
PC Ben Henwood said: “I need to speak to anyone who saw the crash or the vehicles being driven in the moments beforehand.
“If you saw any part of what happened, please contact us.”
Anyone with information should email firstname.lastname@example.org quoting serial 1025 of 17/02, call 101 or contact the independent charity Crimestoppers anonymously on 0800 555111.