A female pedestrian died after she was struck by a car on Fern Street, Gerringong about 11.25am on Saturday. The vehicle was then involved in a crash with a Mitsubishi Lancer.

Ambulance paramedics treated the woman at the scene and a rescue helicopter was called, however, the woman died en-route to hospital. 

Just before 7am on Sunday, a member of the public came across an overturned car off the side of the Old Hume Highway near Berrima and called police.

A 30-year-old man was dead inside the car. There were no other passengers.

Paramedics were called to the M1 at Cameron Park, near Newcastle, at 5.30pm on Sunday after reports of a serious crash.

The two victims – a woman in her 30s and a boy believed to be seven years old – were pedestrians, according to a NSW Ambulance spokesman.

Police said the pair were hit by a truck.

In a separate incident, two men died near Deniliquin on Sunday evening when their ute rolled.

A 64-year-old man died earlier on Sunday when he crashed his motorbike while riding in the Tweed region.

Two other people also died on NSW roads on Saturday.

with AAP