Children between 1 and 15 years must wear a child restraint or a seatbelt if one is available. There is nothing as good as an approved child safety seat for children weighing between about 9kg and about 18kg. Children should continue to use one for as long as possible.
If no restraint is available, children under 16 must travel on the back seat.-------看来car seat不是必须呀,只要坐在后座上就行
但的确要求car seat:
To travel safely by car, all children should be seated in
the rear seat in an approved child restraint suitable for
their size and weight. Road safety experts in Australia
recommend the use of child restraints until the child is
26kg or approximately 7 years old.