Firefighters said the 19-year-old woman turned out of the emergency U-turn lane and into the path of the oncoming truck about 10am.

The truck cut her sedan in pieces, sending the driver's section of the car flying one way and carrying the rear end along.

Despite the damage inflicted on her Honda Civic the woman walked away from the wreck with only a bump on the head and minor injuries to her shoulder and side.

She was taken to John Hunter Hospital in a stable condition.

Emergency services said they were amazed she survived.

"She's amazingly lucky, amazingly," deputy fire captain Evan Dowling said.

"We don't see many cars cut into two like that any more, it's a real lucky escape."

Newcastle Highway Patrol officers are investigating the crash and expect to speak to the woman over the weekend.

Tom Corey, who was driving the truck that collided with the car, said he initially thoughts things would be a lot worse.

"I saw her turn out and I just went 'Oh shit'," he said.

"She's very lucky."

He said the crash had caused about $60,000 worth of damage to his truck.

In another crash, an 80-year-old couple was injured when their car rolled near Singleton about 1.30pm.

Paramedics said the male driver lost control of the car on the New England Highway and rolled.

The female passenger suffered head injuries and both were flown to John Hunter Hospital.

A passing motorist stopped to help the couple and freed the woman who was trapped in the overturned vehicle.