An 18-year-old man is fighting for life in hospital after a serious crash in Cooloongup.
Police say a yellow MG hatchback and the teenager's motorbike collided on Murchison Road about 1pm on Tuesday, November 19.
The rider was rushed to Royal Perth Hospital with critical injuries.
It is understood the driver of the MG was not injured.
Major Crash investigators are appealing for any witnesses to contact Crime Stoppers on 1800 333 000 or report the information online at www.crimestopperswa.com.au.
All reports can be made anonymously.
Dash-cam or mobile phone vision relating to this crash can uploaded directly to investigators via this link: https://wapf.au.evidence.com/.../seriouscrashcooloongup