The Forensic Crash Unit is investigating after a man was left in a critical condition following a serious traffic incident at Logan overnight.
Investigations indicate about 11pm, a 20-year-old Bethania man fell from a Subaru Forester while it was travelling on Eagle Drive.
The man sustained significant head injuries and was transported to the Princess Alexandra Hospital where he remains in a critical condition.
The driver of the vehicle, a 19-year-old Slacks Creek man, is assisting police with their inquiries.
Anyone with information or dash cam vision which may assist investigations is urged to come forward.