The Christmas holiday road death toll has risen to 13, with the latest victims including a teenage driver and a cyclist killed in an apparent hit-and-run accident.
An 18-year-old woman died on Friday after the ute she was driving rolled near Narrabri in northwest NSW.
Earlier, a female cyclist was killed in an alleged hit-and-run near Adelaide.
Police allege a 37-year-old woman hit the cyclist at Lower Inman Valley and drove off.
About an hour later, a police patrol on the Southern Expressway at Lonsdale spotted two people in a car with front-end damage and a cracked windscreen.
Both occupants were arrested and the female driver was charged with causing death by dangerous driving and leaving the scene of an accident.
About noon on Friday a 25-year-old truck driver died when his vehicle left the North South Road at Apple Tree Creek in Queensland and rolled.
Police believe he was not wearing a seatbelt.
Another motorist in southeast Queensland died on Friday afternoon after a crash involving a truck on the Mount Lindesay Highway.
The national road toll period runs from midnight on December 23, 2013, until midnight on January 3, 2014, local times, in line with the Australia New Zealand Policing Advisory Board.