The dashcam video was released by NSW Police on Monday and it shows the boy, who escaped major injury, running across the road before being hit by an oncoming vehicle.

Footage shows the boy being flung to the ground and his shoes fly off before nearby motorists and pedestrians rush to his aid.

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The incident occurred in Sydney's west last week and the boy was taken to Liverpool Hospital as a precaution and treated for minor abrasions, before being released; the female driver was uninjured.

NSW Police Traffic and Highway Patrol Command Assistant Commissioner Michael Corboy said the incident had prompted police to remind motorists and pedestrians of their obligations on the road.

"This young boy is lucky to be alive, and if vision like this isn't enough to encourage people to slow down and drive safely, I don't know what is," he said.

VIDEO: The footage released by NSW Police

"You never know when the conditions may change or the unexpected may occur - and you can't expect children to be predictable.

"There should be no unnecessary distractions when getting behind the wheel or crossing the road."

Long-time road safety expert in the Central West and owner of Calare Academy of Road Safety, Matthew Irvine, said children can be unpredictable around roads and run when excited or scared.

"The kids has done what kids do, it would have been one hell of a fright for the kid," he said.

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Mr Irvine said the release of such graphic footage was bound to insight debate in the community about road safety.

"If police are releasing footage like this they want us to have a conversation around it," he said of the associated road safety aspects involved in this accident.

"Pedestrians as vulnerable road users are always at risk."

Mr Irvine said it was important to note that accidents like this could occur even if motorists followed the road rules and drove to the speed limit.

"For example, a 10km/h difference of speed at point of breaking equals a 35km/h speed at point of impact," he said.

In other words, a motorists travelling at 60km/h will take 16-17 metres to stop, while at 50km/h this will drop to 11 metres - this data is for driving during good weather and road conditions and with good tyres.

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Parents should ensure their children have a thorough understanding of road safety when they are a pedestrian Mr Irvine said.

With younger children, he said they should always be supervised when around a road, hold the hand of an adult or responsible person and dropped off to the door of where they are going.