Police are investigating a single vehicle crash at Noarlunga Downs overnight.

Just after 12.30am this morning, Sunday 27 August, police and emergency services received reports of a car rollover on River Road.

On arrival at the scene they located a Subaru station wagon which had left the sealed road, collided with vegetation and rolled.

All four occupants received treatment at the scene and conveyed to Flinders Hospital with serious non-life threatening injuries.

The driver, a 22-year-old female from Aldinga Beach is expected to be charged with driving without due care. A blood sample was also taken. Pending results, the driver maybe be charged with further offences.