A group of five young men were in the car behind the Nissan. One of the men, who did not want to be named, said the Nissan slowed down as it came to the intersection, but he believed it did not stop.
The ute swerved to try to avoid the car but collided with it, he said.
The man said the passenger of the Nissan "flew" out of the front window and was lying unconscious on the road.
The driver was unconscious and two women in the back were awake, he said. "They had to cut the roof off to let the driver out. The two in the back were conscious but pretty shaken up. They were crying."
One of the women was airlifted to Waikato Hospital by the Westpac Rescue Helicopter where she remained in a critical condition in ICU last night.
The other women were reported to be in a stable condition.
Mr Lyttle said the ute driver "suffered only minor injuries and walked away relatively unscathed."
Police wish to thank members of the public who assisted with traffic control.additional reporting Sandra Conchie