South Australia roads
The state has changed its shielded route numbering system, which was used in the past and into a new alphanumeric style. Before the alphanumeric style, the state had been using the Nation Route system of NAASRA which. NR8 was the first national route in the state, and the year after that, the Stuart highway was designated as NR20 while Princes Highway was designated as NR1. The plan in place for the National Routes was implemented across the board except with NR83. Later in the 1980s, South Australia made the decision to extend two State routes from Victoria, which stopped at the border of the two states. The signposting for these routes was poorly done, and the same thing also happened with some Tourist Route. Adelaide metropolitan did not have a numbering system, and the two routes that were within the limits of the city were National Routes 1 & 20, and both routes are actually interstate routes. In 1998, the government decided to initiate the alphanumeric numbering system, which would replace the National Routes finally. However, there are still remnants of the old system. With the new alphanumeric system, more routes well signposted and numbered, which will help tourists and interstate travellers to find their way around the state more easily. With this new initiative, the national routes still had their old numbers, and they now only have new classifications. South Australia is using only the A, B and M classification of its route. This alphanumeric system is in different categories.