A CYCLIST is recovering from fractures after he was thrown into the air and hit a car windscreen when a motorist hit the back of his bicycle in Belhus on Monday.

About 4.30pm a 37-year-old High Wycombe man was travelling north on Great Eastern Highway in a silver Hyundai station sedan when he struck the back of a bicycle just before the West Swan Road intersection.

The rider, a 47-year-old man from Henley Brook, was thrown into the air and hit the windscreen before landing on the road.

The driver then continued north and at the intersections of West Swan Road he crossed onto the wrong side of the road and hit a Toyota 4WD, turning right onto Great Northern Highway.

The driver then veered back to the left hand side of the road and hit the front of the first car stationary at the lights before stopping against the second car in the turning lane.

Camera Icon Traffic Enforcement Group crash investigators are seeking assistance from the public regarding a serious crash in Belhus on Monday 25 April 2016. Credit: Supplied, WA Police

The cyclist was taken to Royal Perth Hospital with fractures to his eye socket, spine and arm, and numerous grazes.

The drivers involved were not injured.

Traffic Enforcement Group Investigators would like to speak to anyone who saw the silver Hyundai station sedan before the crash or the collisions themselves, particularly anyone who may have dash cam footage.

Anyone with information is asked to call Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au.