TRAFFIC Enforcement Group crash investigators are seeking public assistance after a man was thrown from his bicycle on Great Northern Highway in Belhus last week.
About 4.30pm on Monday, April 25, a silver Hyundai station wagon collided with the rear of a bike just before the intersection of West Swan Road.
The 47-year-old rider from Henley Brook was thrown into the air, before striking the windscreen of the car and landing on the road.
The driver of the Hyundai continued on the highway, crossed on to the wrong side of the road and collided with a Toyota four-wheel drive.
The driver then veered back on to the left hand side of the road and struck the front of another car before coming to a stop.
The cyclist was taken to Royal Perth Hospital with fractures to his eye socket, spine and arm, and numerous grazes.
The drivers of the vehicles involved were not injured.
Investigators would like to speak to anyone who saw the vehicle prior to the collisions or the collisions themselves, particularly anyone who may have dash cam footage.
Anyone with information can call Crime Stoppers on 1800 333 000 or make a report online.