Casey Highway Patrol officers are appealing for public assistance following a collision in Hallam this morning.
It is believed a truck travelling north on Belgrave Hallam Road collided with a pedestrian at the intersection of Frawley Road about 6.30am.
The pedestrian, who is yet to be formally identified, was taken to hospital with serious injuries.
The driver of the truck, a 50-year-old Cranbourne West man, remained at the scene.
The exact circumstances surrounding the collision are yet to be determined and an investigation remains ongoing.
Anyone who witnessed the crash, has dashcam/CCTV footage or information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au