The shocking moment a man punches a woman in the face in a horrifying road rage attack has been caught on camera.

Dwayne Pillidge posted the confronting dash cam footage to Facebook on Monday afternoon after witnessing the attack unfold.

He claims the violent incident took place at Doyalson at Lake Macquarie, about two hours north of Sydney.

Dash cam footage has captured the shocking moment a man punches a woman in the face while stopped at a traffic light

The man strikes the woman directly in the face, snapping her head backwards, and then calmly walks back to his ute

In the footage, the man can be seen stepping out of his ute at a traffic light and approaching a female passenger standing by her door with her arms crossed.

Without warning he strikes the woman in the face, snapping her head backwards with the pure force of the blow.

She recovers from the punch and steps into her car, attempting to reverse towards the man who begins to calmly walk back to his vehicle.

'This is after the woman in the front car was tossing things from her window at his car,' Mr Pillidge wrote on the Facebook post.

'I don't care what your reason, it is not OK to hit a woman.'

A woman claiming to be the victim seen in the video took to Facebook to defend herself after a huge number of men tried to justify the horrific attack.

'I don't give a f*** he hit me, don't put a babies life at risk,' she wrote.

'He tried running us off the road with a 5 month old baby in the car we tried getting away from (him but) he kept going so I got out and asked what his problem was.'

She uploaded two images showing a bruised and bloody upper lip, and said she would be taking the matter to court.

The woman who was struck in the face took to Facebook to upload images of her bruised, bloody lip and said she would be taking the matter to court

A woman claiming to have been in the driver seat of the victim's car said the man had been tailgating her with her son in the car, so she had begun throwing things at his vehicle

Another woman, believed to be in the driver seat of the same car, also took to Facebook to tell her alleged side of the story.

She admitted to throwing nails out of the car window after the man took issue with her driving and began tailgating her.

'So your saying it was ok (sic) for him to tailgate me with my son in the car, trying to run us off the road,' the woman claimed.

'But it's not ok for her to throw things at him to get him off my tail after I have merged into the opposite lane.'

A spokewoman for NSW Police told Daily Mail Australia that a woman claiming to be the person struck by the man had contacted police but not yet been interviewed.

The spokeswoman said officers were hoping to speak to her today to get a clearer idea of exactly what happened.

'However at this time no formal complaint has yet been made and so we are still appealing for any other witnesses to come forward,' she added.

'Police have seen the vision and are examining it.'

Chief Inspector Colin Lott, from the Tuggerah Lakes Local Area Command, condemned the man's actions and called for him to come forward.

'The level of violence is totally unacceptable, (but) obviously with any video footage were only getting a snapshot of a whole incident,' he told reporters.

'Assault of any sort is unacceptable especially assault to a female... it won’t be tolerated.'

He said there was 'much conjecture' on social media from people who suggested 'there might have been aggravating circumstances leading up to the event.'

'We are unaware of that (aggravating circumstances) and we’ve had no one give us formal information to that effect,' he said.

'Ultimately, at some stage, we will be catching up with him.'