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"M" routes are primary traffic routes, called motorways in some states. These are typically dual carriageway, freeway-standard highways, but may also be used for rural roads that are nearly at freeway-standard, or at least are dual carriageways.
"A" routes are other primary highways, including urban arterials and interstate or interregional single carriageways.
"B" routes are less significant routes, either as an alternative to an "A" or "M" route, or linking smaller population centres to larger regional centres, but without being a major through-route in the region. These are the major road links in areas without "A" routes.
"C" routes link smaller settlements and towns to the rest of the major road network. They are used for roads without the significance of an "M", "A", or "B" route, but where numbering would assist navigation. |
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