A third person suffered moderate injuries and was treated by ambulance staff.
A resident near the scene of the crash said the survivor yelled at police to get his partner out of the car as she was pregnant, Stuff reported.
"The crash was a tragic outcome that nobody wants," Todd said.
"Police encourage any driver who is signalled to stop by police to do just that."
A full investigation into the circumstances of the crash had started and the Independent Police Conduct Authority had been notified.
The area around the crash scene was closed and diversions were in place. Police are asking motorists to avoid the area.
"It is not worth putting your life, your passenger's life, or anyone else's life at risk."