The Westpac Rescue Helicopter was tasked, but in the meantime the 18-year-old man was taken to Port Macquarie Hospital.

The helicopter was then diverted to the hospital to assist him.

It is believed that the patient was the front seat passenger in the vehicle.

The young man is believed to have amputated his left arm just below the shoulder in the incident.

He is being stablised for transport by the helicopter medical crew and will be taken to the John Hunter Hospital in a serious condition.

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