Emergency services were called at around 3.45pm on December 30 to the highway near Rockdell Road in Lyndhurst.

"There were reports of a semi-truck that has jackknifed," a spokeswoman for NSW Police said.

"The driver is alive and out of the vehicle."

Jackknifing is when the trailer of a large semi-truck or big rig pushes the front towing vehicle to one side.

A Toll helicopter has been called to the scene.

Just before 5pm, NSW Ambulance Service said that paramedics were assessing a man in his 60s as a result of the single-vehicle crash and that he appeared to have potential rib injuries.

NSW Police said the road would remain closed until the helicopter had left the scene.

"There is a delay in place due to the availability of a tow-truck that can take a truck," the police spokeswoman added.

"After the helicopter leaves, a contraflow will be put in place until the truck is removed."

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