Two men have died after a car crashed into a parked truck trailer on the Augusta Highway in Winninowie on Monday morning, August 13.
Police and emergency services were called to the area about 15 kilometres south of Port Augusta just before 4:30am.
The driver of the car, a 20-year-old Davoren Park man, and the only passenger, a 30-year-old Hendon man, died at the scene.
Major Crash Investigators are examining the circumstances of the collision.
Northbound traffic are advised to use Horrocks Pass Road and Spear Creek Road, while southbound traffic can use Flinders Ranges Way, McConnal Road and Spear Creek Road.
Road closures should remain in place until about 1pm today.