St John Ambulance, the Department of Fire and Emergency Services and WA Police were called to the scene about 12.30am after the yellow Hyundai hatchback hit a tree on the median strip.
A resident who lived nearby said he went to help but saw another car pull up and pull a person from the car wreckage.
When emergency services arrived, a female who was on the scene claimed to be the only person in the car.
She was taken by St John Ambulance to Royal Perth Hospital for minor injuries.
A police spokeswoman said they would be making further inquiries into whether there were more people in the car at the time.