Nunawading Highway Patrol are investigating a four-vehicle collision in Oakleigh about 12.15am this morning.
It is believed a driver in a Mercedes sedan was travelling along Warrigal Road when they collided with a blue Nissan Micra.
The impact forced the second vehicle into two other cars.
The driver of the sedan, an 82-year-old Eltham woman, sustained life-threatening injuries and was taken to hospital for treatment.
No other drivers were injured.
The exact cause of the collision is yet to be determined. Investigations remain ongoing.
Anyone who witnessed the incident or has information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au
