Police say a motorbike rider was looking behind him just as he was about to change lanes when he slammed into the back of a stationary car at Adamstown last night.
The accident happened just after 7.00pm on City Road near the Brunker Road intersection with a Kawasaki motor bike colliding with the back of a Mitsubishi which was waiting in a line of traffic.
The man in his early 20's ended up on the roof of the car.
He was taken to the John Hunter Hospital with a suspected broken wrist.
