The Road Traffic Act, 1933 requires all drivers of mechanically propelled vehicles in public places to have at least third-party insurance, or to have obtained exemption – generally by depositing a (large) sum of money to the High Court as a guarantee against claims. In 1933, this figure was set at £15,000.[21] The Road Traffic Act, 1961[22] (which is currently in force) repealed the 1933 act but replaced these sections with functionally identical sections.

There are three states that do not have a private CTP scheme. In Victoria, the Transport Accident Commission provides CTP through a levy in the vehicle registration fee, known as the TAC charge.[7] A similar scheme exists in Tasmania through the Motor Accidents Insurance Board.[8] A similar scheme applies in Western Australia, through the Insurance Commission of Western Australia (ICWA).[9]

Auto insurance is financial protection, and not just for the investment you made when you bought your car. After a really serious accident, bills for damage and injuries can easily reach into hundreds of thousands of dollars. If you happen to cause such a wreck, the victims could sue you. In the worst case scenario, assets such as your savings and home could be seized.