Man head butts car window in horrific road rage attack in Sydney

A driver has cowered in his car with his children in the back during a horrific road rage attack in Sydney.

A witness taking their young daughter to the the doctor managed to film the incident just after 1pm on Wednesday on Roberts Road in Greenacre.

The vision shows the driver of a ute with Queensland number plates arguing with another motorist, before he gets out of the car.

One of the drivers can be heard screaming to "open the f***ing door," before swiping at the rear view mirror.

The man smashes the side mirror off with his hand. Photo: 7 News
The man smashes the side mirror off with his hand. Photo: 7 News

The witnesses then stopped filming the fight as they started to fear for their own safety and that of their daughter.

"If the bloke sees my wife recording he might have hit my window and because I had a family in the car I didn't want things to get worse," the witness said.

Police said they are investigating.

The vision shows the driver of a ute with Queensland number plates arguing with another motorist. Photo: 7 News
The vision shows the driver of a ute with Queensland number plates arguing with another motorist. Photo: 7 News
One man is seen hitting the window with his head. Source: 7 News
One man is seen hitting the window with his head. Source: 7 News