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This article is about the idea of State highway, '''state road''' or '''state route''' can refer to one of three related concepts, two of them related to a State government in a country that is divided into states (including the United States , Australia and Mexico ): #A road ''numbered'' by the state, falling below numbered National Highway s (like U.S. Route s) in the hierarchy #A road ''maintained'' by the state, including nationally-numbered highways Depending on the state, state highway may be used for one meaning and state road or state route for the other. A third meaning, used in some countries such as New Zealand , uses the word "state" in its sense of a nation. By this meaning a state highway is a road maintained and numbered by the national government rather than local authorities. TERMINOLOGY The usage of the terms "state highway", "state route", etc. may vary from country to country or even from state to state. In the United States, it is not uncommon for the general public to use different conventions even within a particular state. For example, in Washington , a state highway would be referred to as S.R. 500 (for State Route 500). In Oregon , it could be referred to as OR 18 (for Oregon Route 18), while in Idaho it would be S.H. 51 , short for State Highway. NATIONAL USAGE Australia Australia 's State Route System is a system of urban and inter-regional routes that are not covered by the National Route System, or the National Highway System. These routes are marked with a blue shield. Sometimes a state route may be formed when a former national route is Decommissioned . Italy Italy's extend for some 12,000 km, overseen by the Azienda Nazionale Autonoma Delle Strade (ANAS) founded in 1946, replacing the A.A.S.S. (Azienda Autonoma delle Strade Statali) of 1928. New Zealand See Also: New Zealand State Highway network administers them. The speed limit for most State Highways is 100 Km/h , with reductions when a State Highway passes through a built-up area. The highways were originally designated on a two-tier system, National (SH 1-8) and Provincial, with national highways having a higher standard and funding priorities. Now all are State Highways, and the network consists of SH 1 running the length of both main islands, SH 2-5 and 10-58 in the North Island, and SH 6-8 and 60-99 in the South Island. National and Provincial highways are numbered approximately North to South. State Highway 1 runs the length of both islands. United States State highways are generally a mixture of primary and secondary roads, although some are Freeway s (for example, Route 128 in Massachusetts, Ronald Reagan/Cross County Highway ( Route 126 ) in Cincinnati, or parts of Route 101 in New Hampshire). Each state has its own system for numbering and its own marker. The default marker is a White Circle Containing A Black Sans Serif Number (often inscribed in a black square or slightly rounded square), according to the '' Manual On Uniform Traffic Control Devices ''. However each state is free to choose a different marker, and many states have. Often, states will choose an outline of something related to the state to distinguish state highway markers; many have adopted an outline of the state map for state route signs. However, this is not always the case – for instance, Pennsylvania , nicknamed the " Keystone State," uses the outline of a keystone for its state highway markers. Also, Kansas uses the shape of a Sunflower with the highway number in the middle. Some states have a system of secondary highways in addition to state routes. A prominent example is Missouri , which designates its so-called Supplemental Routes with letters instead of numbers. SEE ALSO
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