Acting Inspector Paul Hoyer addressed the media outside Nowra Police Station at 9.30am on Monday, July 6, to speak about the collision between a 15-year-old boy on a BMX bike and a ute driven by a man on Sunday, July 5.

"Depending on the outcome of enquiries charges may be laid at a later date," Acting Inspector Hoyer said.

"We are looking at all avenues, and how that intersection is controlled forms part of our investigation.

"We will look at the traffic lights, their sequence and function, as well as the young teenager on the bike, what the sequence of lights were for him as well.

"We're aware there have been allegations the driver may have been using his phone and again that's part of our investigation."

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The boy was treated by ambulance officers at the scene and taken to Shoalhaven Hospital before being flown to Westmead Childrens Hospital in a serious condition.

The male driver was taken for mandatory drug and alcohol testing and interviewed by crash investigators before he was released.

Detective Inspector Hoyer plead for all road users to take care, after this accident and another, fatal accident involving a teenager occured on Shoalhaven roads in a single week.

"It falls upon all people, all drivers, kids on their bikes to be mindful of road conditions and we as all road users to take extra care as there is extra school-holiday traffic on the streets," he said.

"It should be very concerning to everyone. These accidents are traumatic for observers, emergency service workers, the driver of the vehicle and the parents of the child.

"We ask everyone to be as safe as possible on the roads."