Liverpool's Minh Thien Ho caused chaos on the busy road on March 25 when his freight truck collided with a power pole, parked car, and several fences and road signs.

In an agreed set of police facts tendered to Wollongong Local Court, the truck then hit the median concrete barrier causing it to become airborne, before crashing into other cars on the opposite side of the road.

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The 30-year-old driver was able to free himself from the wreckage after the truck landed on its side and bust into flames.

The police statement said a witness was travelling in the opposite direction and had to slam on the brakes and reverse quickly to avoid a collision.

Police, NSW Fire and Rescue and Ambulance NSW crews rushed to the scene.

Ho was taken to Wollongong Hospital complaining of a sore right arm.

In a bedside interview, Ho told police he was travelling 20km/h when his brake warning light activated on his dashboard.

The driver said he tried to find a safe place to park but lost his brakes.

Ho claims he swerved to avoid crashing into the car in front of him which caused him to collide with the power pole and concrete barrier.

A blood sample showed Ho was under the influence of methylamphetamine and had enough in his body so that his "driving would have been impaired".

Kerry Davenport spoke to Mercury just after the crash claiming he saw the truck "flying, it looked like it had no brakes whatsoever."

"It's made a right mess - if that concrete barrier hadn't been there it would have gone through some houses," he said.

The truck crash prompted Roads and Maritime Services to carry out a safety review of Bulli Pass and the barrier was repaired.

Ho plead guilty to negligent driving and driving a vehicle while under the influence of drugs.

He will be sentenced in Wollongong Local Court on Friday.