Tragedy on NSW roads with four fatal accidents being investigated by police.

A woman died on Saturday night when her ute veered off Banjo Patterson Way, about 10km south of Yeoval, and hit a tree, causing it to roll. She was alone in the vehicle when it crashed about 8.30pm.

Earlier in the evening, another woman died when her sedan veered off Forrester Road and hit a power pole in the western Sydney suburb of North St Marys.

On Saturday morning, a man died after his car crashed into a tree in Sydney's Mt Druitt. The driver, a 28-year-old man, died at the scene.

And at 6.30am, another ute veered off the road and hit trees on Yapunyah Street, Barellan, about 50km east of Griffith.

AAP