Police are investigating the circumstances of a fatal crash on Peak Downs Highway, five kilometres west of Eton.
At 3pm, a Mitsubishi ute was travelling west along the highway when it rolled down an embankment.
Emergency services and members of the public rendered first aid to a 55-year-old man, however he was declared deceased at the scene a short time later.
He was the sole occupant of the vehicle.
Investigators are appealing for anyone who witnessed the crash or has dashcam footage to come forward.
Officers from the Forensic Crash Unit are investigating.