History
When the National Route Numbering system was adopted in 1955, Highway 1 was the only true national highway. Many of the other national routes are tributaries of Highway 1.
With the introduction of the National Highway system in 1974, the significance of Highway 1 diminished, as large sections were not included in the new system. In the 1990s, Victoria and South Australia adopted alphanumeric route numbering, but retained the number 1 along the length of the highway in both states, with the letters M, A or B denoting the grade of the road.
Under the original Highway 1 scheme, certain major traffic routes that ran parallel to the main route were designated National Route Alternative 1. Most of these route designations have been replaced by either a state route designation, or an alpha-numeric route designation, depending on which state the section is in. An example of the Alternative 1 designation remaining is on the old Princes Highway route from Dandenong to South Melbourne in Victoria.
Read more about this topic: Highway 1 (Australia)
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