Hit And Run Driver May Not Ever Know He Hit Someone

A boy is in a serious condition after being struck in a hit and run in the Hawksbury region last night.

The 14 year-old was walking west through North Richmond at around 9pm when police say he was struck by the passenger-side mirror of a small truck on Bells Line of Road.

The vehicle did not stop to see if he was alright.

He suffered fractures to his shoulder and ribs as well as a serious head injury.

Despite this, he managed to stagger several hundred metres to the other side of the bridge for help - and help found him.

A passing motorists stopped and called triple zero prompting the arrival of police and ambulances as well as the Toll Ambulance Rescue Helicopter.

They worked on him for several minutes before he was transported to a waiting chopper in Hanna Park, on the other side of the main road.

He was flown to Westmead Children's Hospital where he remains in a serious but stable condition.

Police canvassed the area into the night and found debris from a vehicle which they believe could be connected to this hit and run.

“This consisted of what we believe to be part of a side mirror from maybe a light vehicle...a small delivery van - something larger than a sedan but smaller than a semi-trailer," Inspector Gary Simms told reporters.

"I believe this is a very fortunate situation; anyone who is impacted by a motor vehicle, particularly at night time, runs the risk of very serious injuries and we're just thankful that he was found and he was able to receive expert assistance."

He added that the teen was wearing dark-clothing while walking along the busy, dimly lit road and says it is entirely possible that the driver did not realise they had hit him.

Security vision has been seized from neighbouring businesses and will form a major part of the investigation.

Police are still appealing for anyone with dash-cam vision, or was driving through the area at the time, to come forward.