"It went on for a while. There was a bit of how's your father and yelling and carrying on."
With traffic jamming up behind the cars and the melee, several members of the public shouted at them to move on.
The witness said the guy in the front car had the final say. He went back, grabbed a wooden batten and proceeded to smash the windscreen of the other car. Both cars then drove off before police arrived.
He did not see what sparked the confrontation further down the road before the two cars reached the intersection.
A couple of beanies left behind by the brawling men marked the spot where the road rage incident happened.
Police issued a statement at 6.50pm yesterday that no arrests had been made at this stage and inquiries into the incident were ongoing.