Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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 SR 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 SH-51, short for State Highway.

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