Police are investigating after a woman was seriously injured in Little River, 11 December.
Investigators have been told the woman came out of a Honda sedan that was travelling south on Princes Highway about 11.30am.
A 30-year-old woman from Tarneit was flown to hospital with life-threatening injuries.
The driver of the car a 28-year-old man from Tarneit, stopped at the scene and has spoken with police.
The exact circumstances of the incident are yet to be determined.
The investigation is ongoing.
Anyone with information, dashcam vision or anyone who witnessed the crash or the vehicle driving erratically prior, is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at