A Swiss national and a pedestrian are among four people killed in crashes on South Australia's roads this weekend.
A Victorian woman has been charged over one of the crashes which killed a Swiss woman and injured two others on Saturday.
A sedan and four-wheel drive crashed head-on at Langhorne Creek, south of Adelaide just after 4pm (CDT).
The sedan driver, a 56-year-old woman from Switzerland, died at the scene.
Another passenger and the driver of the other vehicle were airlifted to the Flinders Medical Centre with serious injuries.
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Both are in a stable condition.
Police arrested and charged a 61-year-old woman from Victoria with aggravated careless driving.
Meanwhile, a young man died when a car veered onto the wrong side of the road and hit a taxi and then a tree at Clearview, north of Adelaide, just before 6am (CDT) on Sunday.
Police said a passenger of the car, believed to be a 23-year-old male, was killed while six others from both cars were taken to hospital with serious injuries.
Another young man was killed in a separate hit-and-run collision south of Adelaide.
Police say the 21-year-old was struck by a car as he walked along Hermitage Drive, Angle Vale, early Sunday morning.
Police have arrested an 18-year-old man from Angle Vale after he presented himself to police following reports of a fatal hit-and-run.
He is being interviewed.
In a separate collision, one person was killed and five others hospitalised after a head-on crash between two cars at Northfield, in Adelaide's northern suburbs.
The cause of the crash is yet to be determined.
