The national road toll has now reached nine in just the first three days of the holiday season.
The latest casualty was a nine-year-old girl who was the passenger in a ute that flipped and rolled on the Coolgardie-Esperance Highway south of Norseman in Western Australia at about 5.30pm on Christmas Day.
A woman was also killed in a two-car crash in Canberra on Christmas Day.
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The accident came just hours after a 43-year-old man died in hospital after being struck by two cars in NSW on Christmas Eve.
Police have spoken to a number of witnesses and will investigate the full circumstances surrounding the incident as they prepare a report for the Coroner.
The Northern Territory is the only state or territory not to record any road deaths since the toll started on Wednesday.
Police around Australia have increased safety operations over the Christmas period, including stepping up drug and alcohol testing.