This in from NSW Police:
Police will prepare a report for the Coroner after the death of a man following a single-vehicle crash near Canberra this morning.
About 3.50am a car was travelling on the Barton Highway at Jeir, 40kms south-east of Canberra, when it left the roadway and went into a ditch.
The driver, an 18-year-old man from Canberra, suffered serious injuries and was taken to Canberra Hospital but later died.
His 17-year-old male passenger suffered minor injuries and was also taken to Canberra Hospital.
The road has since reopened.
Our condolences to family and friends.