A woman has died after a large branch fell onto her car in the NSW Southern Highlands today.

Emergency services were called to the Illawarra Highway, between Church Street and Burrawang Road, Burrawang, 20km south-east of Bowral, at 4.30pm Saturday 21 January, after reports of a crash.

A witness has told police the woman’s station wagon was travelling west when a 20m branch hit the windscreen.

The driver, believed to be aged in her 50s, died at the scene. She is yet to be formally identified.

Officers from The Hume Police District established a crime scene and commenced an investigation into the circumstances surrounding the crash.

A report will be prepared for the information of the Coroner.