A MOTORBIKE rider is fighting for life, after colliding with a 4wD on a Sydney Motorway.
Emergency services were called to the M4 at Holroyd about 9.15pm on Friday, to find an injured 25-year-old man on the ground and being assisted by a passerby.
Witnesses say the motorbike and a silver Jeep collided as they entered the M4.
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The motorbike then crashed into a road barrier and the rider was ejected, sliding under a parked truck grader on the side of the road.
The motorcyclist was taken to Westmead Hospital in a critical condition.
The male Jeep driver, 46, was uninjured and taken to Westmead Hospital for mandatory blood and urine testing.
An investigation is underway as officers make inquiries into the circumstances surrounding the collision. Anyone who witnessed the crash and have not yet spoken to police are urged to contact Crime Stoppers on 1800 333 000.