AN ADELAIDE man remains in a critical condition after two trucks collided on Tuesday.
The man, in his 50s, was driving a B-double truck west on the Western Highway at Lawloit when the truck and a tray truck heading east collided about 1.45am.
The other driver, a Melbourne man, 45, died at the scene.
The B-double driver was airlifted to the Royal Melbourne Hospital with life-threatening injuries.
He has remained in a critical condition since.
Horsham Acting Sergeant Tony Sykes said the driver sustained chest injuries in the crash.
Horsham Highway Patrol Senior Constable Mick Ryan said police believed fatigue was the cause of the crash.
He said another truck driver stopped at the scene shortly after it happened and helped extinguish a small fire.
Traffic was diverted between Kaniva and Horsham via the Wimmera Highway and Kaniva-Edenhope Road until 11.30am.
Police asked anyone with more information about the incident to call Crime Stoppers on 1800 333 000.