About 9.40am, a blue Volkswagon Golf was travelling south on the M1, when the driver lost control causing the car to rotate and collide with the rock wall.

The vehicle rotated a second time and collided again with the rock wall causing the front wheels and engine to separate from the car, police said.

The 18-year-old male driver was able to free himself from the wreckage.

His 18-year-old female passenger remained trapped and was eventually released by emergency services.

She was taken to Royal North Shore Hospital with serious leg and abdominal injuries. The woman underwent surgery and remains in a serious condition.

A crime scene was established, and Crash Investigation Unit commenced inquiries. The vehicle was seized for forensic examination.

The driver, on a suspended provisional licence, was arrested and taken for mandatory blood and urine testing.

He was taken to Woy Woy Police Station and charged with dangerous driving occasioning grievous bodily harm - drive manner dangerous, negligent driving occasioning grievous bodily harm, drive whilst licence suspended and dangerous driving occasioning grievous bodily harm - drive speed dangerous.

He was refused bail and is due to appear in Gosford Local Court on Tuesday.

Anyone who witnessed the incident or might have information that would assist the investigation is urged to contact Crime Stoppers on 1800 333 000.

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