Police are appealing for anyone who witnessed a serious crash on the Toowoomba Karara Road near Leyburn on Saturday to please come forward.
Police report that a green 2002 Holden Commodore was travelling north when the vehicle left the road and collided with a tree.
The driver of the vehicle, a 35-year-old man was airlifted to the Princess Alexandra Hospital in a serious condition with the passenger being transported to the Toowoomba Hospital in a stable condition.
The Forensic Crash Unit continues investigations.
If you have any information regarding the accident, please call Crime Stoppers on 1800.333.000.