SOMERVILLE Highway Patrol is investigating a three-car collision that occurred in Frankston on 7 November.
Investigators have been told a blue Nissan Micra was attempting to make a right hand turn from Skye Road to Dalpura Circuit when a Silver Holden Commodore crashed into the rear of the stationary car.
The Nissan was forced to the oncoming lane where it then collided with a Toyota Land Cruiser.
The female passenger of the Nissan was airlifted to hospital with life-threatening injuries. The female driver of the vehicle was transported to hospital with non-life threatening injuries.
The male driver of the Toyota and a female passenger were also taken to hospital with non-life threatening injuries.
The male driver of the third vehicle is assisting police with their enquiries.
Police are appealing for anyone with dash-cam footage of the Silver Holden Commodore or the collision to contact Crime Stoppers of 1800 333 000 or submit a confidential crime report at www.crimestoppersvic.com.au.