Officers from the Cairns Forensic Crash Unit are investigating a crash that occurred at about 1.50pm yesterday on the Bruce Highway at Woree.
Police allege a 24-year-old Belvedere man suddenly stepped in the path of a semi-trailer that was travelling south on the Highway.
Police allege the 68-year-old male truck driver swerved to avoid hitting the man, however he was struck by the truck and sustained serious injuries.
The truck driver and witnesses stopped to rendered assistance and the man was conveyed to hospital by ambulance.
Forensic Crash are investigating and appealing to potential witnesses and motorists with dash camera vision travelling in the area at the time.