"He hit it hard and it bounced out of the way and then bam he hit the second car," the man said. "The lights went green and those poor people never saw him coming."
The vehicle went up onto the footpath next to the lane of oncoming traffic before it collided with a traffic light, bending it backwards.
"He then did a runner."
Witnesses reported seeing at least two members of the public chase the man who fled in the direction of Whangārei Hospital while other people contacted police.
At the Maunu Rd and State Highway 1 intersection closer to town police were speaking to the occupants of a car with damage on the back of the vehicle.
The car was believed to be linked to the same incident.
A police spokesman said no-one was seriously hurt in the incident.
Officers successfully located the driver but did not disclose where the man was found.
Enquiries are ongoing into the crash.