Police are appealing for witnesses after a two-car collision in Keilor North on Wednesday.
It is understood the drivers of a Grey Toyota Kluger and white Toyota van collided on the Calder Freeway, inbound east of Calder Park Drive, at 1am.
Both occupants have exited the vehicles and fled the scene.
Police are making inquires to determine who was driving the vehicles at the time of the incident and investigating the circumstances surrounding the incident.
Anyone with information can contact Crime Stoppers on 1800 333 000 or www.crimestoppers.com.au.