The road toll has risen to 31 with the death of two people in the states south east.
Just before 10pm, police and Emergency Services were called a two car crash on Canunda Frontage Road, Tantanoola.
Two young men from one car died at the scene. Another young man from that car was flown to Adelaide and is in a critical condition.
The sole occupant of the second vehicle was taken to hospital with non life threatening injuries.
Motorists are advised that Canunda Frontage and Boundary Roads are still closed to all traffic.
Major Crash Officers are at the scene and are investigating the circumstances of the crash.
The road toll was 35 at the same time last year.