Road transport is an essential element of the Australian transport network, and enabler of the Australian economy. Australia relies heavily on road transport due to Australia's large area and low population density in considerable parts of the country.
Another reason for the reliance upon roads is that the Australian rail network has not been sufficiently developed for a lot of the freight and passenger requirements in most areas of Australia. This has meant that goods that would otherwise be transported by rail are moved across Australia via road trains. Almost every household owns at least one car, and uses it most days.
Victoria is the state with the highest density of arterial roads in Australia.