A 38-year-old cyclist suffered a broken leg, facial injuries and bruising after his bike collided with a car on a by-pass.
The crash happened on the A24 at Horsham at 9.45am on Monday, near the waterworks at Broadbridge Heath.
The driver of the other vehicle involved, a 59-year-old woman from Horsham, was not injured, but has been reported for careless or inconsiderate driving.
The injured man was taken to the East Surrey Hospital in Redhill for treatment.
Witnesses are asked to call Sussex Police on 0845 6070999, quoting Operation Saltash.