Police say they began following the car, which has two passengers in it, after an aggravated robbery in Henderson Valley.
A witness said he saw around 10 police cars and a helicopter in the area, as the pursuit unfolded. Traffic was eventually brought to a standstill near the Te Atatū Rd off-ramp.
The witness said four to five police cars surrounded a car on the motorway overbridge, where it had collided with another car.
Te Atatu incident: Police pursuit following reports of aggravated robbery in Henderson Valley. Photo / Supplied
At least one man was seen lying on the ground next to the car with an armed police officer nearby.
A police spokeswoman said the person in that car was hit by the fleeing driver, and was believed to have sustained moderate injuries and had been taken to hospital as a precaution.