A truck careered into several vehicles in Upper Ferntree Gully after its driver lost control, say police.
On Tuesday 11 December about 8.20am, a truck travelling south on Mount Dandenong Tourist Road lost control and collided with several vehicles before coming to a stop on Burwood Highway near Dawson Street.
A man was trapped in a vehicle and taken to The Alfred hospital in a serious condition with head and chest injuries.
A number of other people were also taken to hospital with serious but non life-threatening injuries.
Anyone with information or dash-cam footage should call Knox Highway Patrol on 9881 7900 or Crime Stoppers on 1800 333 000, or submit a confidential crime report at www.crimestoppersvic.com.au.