The national road toll has more than doubled, from five on Christmas Eve to 13 on Christmas Day.
In NSW yhe Christmas holiday road toll rose to four with the death of a man in a single vehicle crash near Tamworth on Sunday morning.
About 10:30am on Christmas Day a man was driving his white Toyota Camry north along the New England Highway, about 10km north of Wallabadah, when he crashed into a tree.
A passing motorist witnessed the crash and stopped and attempted to render first aid to the man who was trapped inside his vehicle.
Police, ambulance paramedics, firefighters and the Volunteer Rescue Association were called to the crash, but the man died at the scene.
The man, believed to be aged in his 20s, is yet to be formally identified.
Police are continuing their investigations into the circumstances surrounding the crash and will prepare a report for the information of the Coroner.
Two people were killed when a car veered off the road and crashed into a steel guard rail in Tweed Heads, on the far north coast NSW, early on Sunday morning.
On Christmas Eve, an 83-year-old man died on the Kings Highway in Warri in the state's south.
In South Australia the holiday road toll is two. The latest victim was a 29-year-old driver who was killed on Christmas Day just four kilometres from his home.
In Western Australia, a 27-year-old Taiwanese man was killed at Brookton.
The Northern Territory recorded its first road death of the Christmas season when a 37-year-old man was struck by a road train near Elliot, about half-way between Darwin and Alice Springs, early on Christmas Day.
Tasmania and the ACT are fatality-free so far.