There is not the infrastructure to make cross country motoring the effortless wonder Americans enjoy. Particularly frustrating is the lack of city freeways. Like the rest of the civilized world, Australia uses the metric system. It is quite enjoyable to be able to cruise under good road and weather conditions at a speed you're comfortable with, not one created by a bureaucrat with a chauffeur. But at 15 over, things are different.
Fines are heavy and the cops display little humor.
Radar detectors are strictly forbidden. The latest rage has been the use of speed cameras. It is generally understood that these are used more for revenue than to improve safety and there is an effort to ban them. Manned radar setups are well hidden and they use unmarked cars. BAC who cause accidents.