A woman has suffered life-threatening injuries after being struck by a car in Truganina.
Police say the woman was crossing Leakes Road around 4.30am Wednesday when she was hit by a white-coloured vehicle.
She was taken to hospital, while the Melbourne-bound lanes Leakes Road were closed for several hours.
The Westgate Highway Patrol believe a number of cars drove past the scene at the time.
Officers are hoping to speak to anyone who may have dashcam footage.
Witnesses or anyone with information is being urged to call Crime Stoppers on 1800 333 000.