One person has died and another is in a critical condition after a single-vehicle crash on the Hume Highway, Gunning.

About 6:45am today, Sunday 30 November, emergency services responded to reports a vehicle had left the roadway and rolled.

A passenger of the vehicle was treated by NSW Ambulance paramedics; however, died at the scene.

The driver was treated at the scene before being airlifted to Canberra Hospital in a critical condition.

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

All southbound lanes of the Hume Highway at Gunning are closed and diversions are in place.

For further information please go to www.livetraffic.com

Anyone with information about this incident is urged to contact Crime Stoppers: 1800 333 000 or hnsw.crimestoppers.com.au Information is managed on a confidential basis. The public is reminded not to report information via NSW Police social media pages.