Police were appealing for public information on a five-vehicle crash on Monash Freeway in Dandenong North.
A truck and four cars collided on the outbound lanes near Stud Road about 3.30pm on Friday 24 February.
The truck driver and two other drivers were hospitalised with non-life-threatening injuries, police say.
A second crash between two tray trucks then occurred 100 metres away, prior to the Stud Road exit.
One of the drivers was taken to hospital with non-life-threatening injuries.
Greater Dandenong Highway Patrol police are investigating.
Any dashcam footage or other information to Crime Stoppers on 1800 333 000 or crimestoppers.vic.com.au
