A Baulkham Hills man, 60, was pronounced dead at the scene of a car accident on the Hume Highway yesterday.
Police said the man was driving south on the highway, at Marulan near Goulburn, in a Holden Cruze when it left the road and hit a tree at about 12.15pm.
The driver died at the scene, police said.
Investigators will prepare a report for the Coroner into the circumstances of the crash.
Anyone who may have witnessed the crash is asked to contact Crime Stoppers on 1800333000.