Police are investigating a crash at Penfield early this morning.
About 3.40am, Tuesday 4 December, a car and scooter collided on the Northern Expressway, the driver of the car was attempting to render assistance to the scooter rider when he was hit by a passing car.
Both men aged 25, and 22, were taken to the Royal Adelaide Hospital with serious injuries.
Police have spoken to the 43-year-old woman driving the second car and she is assisting with the investigation.
Anyone who witnessed the crash is asked to contact Crime Stoppers on 1800 333 000 or report online at www.crimestopperssa.com.au/