Man killed in car crash near Broken Hill

A man has died when his ute crashed and rolled on a highway in the far west of NSW.

The 23-year-old man was driving on the Silver City Highway about 60km north of Broken Hill just after midnight Thursday when it left the road, police say.

He was thrown from the ute and died at the scene.

In a separate incident, a man believed to be aged in his 30s died after the car he was driving collided head on with a bus in northwest Sydney.

Police say the man, who has not yet been formally identified, was taken to hospital after the crash on Thursday afternoon in Epping but he later died.

The 44-year-old bus driver was treated at the scene for non-life-threatening injuries before also being taken to hospital where he underwent mandatory blood and urine testing.