A five-vehicle pile-up near the Stockland Green Hills Shopping Complex yesterday morning disrupted commuter traffic for about an hour.
Four cars and a truck were involved at the accident at the intersection of Mitchell Drive and the New England Highway about 8am.
The accident closed the right-hand lane to east-bound traffic.
Police, ambulance and fire services attended the scene.
Two women were taken by ambulance to John Hunter Hospital and a man was taken to Maitland Public Hospital.
They were reported to be stable late on Thursday.
"The pile-up was the result of one car running into the rear of another, causing a flow-on effect. It was bumper-to-bumper," an ambulance officer said.
"(The cars) were crumbled and their was significant damage."