Road hierarchy: Difference between revisions

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Many countries may have more than one national highway system of a lower rank, such as the [[U.S. Highways]] (not to be confused with the Interstate system), only portions of which run on controlled-access highways. Conversely, there may also be controlled-access highways not part of a numbered system. Highways are usually given icons featuring the number of the highway called [[Highway shield|highway shields or route markers]]. In addition to the national highway system, there may be provincial-level or state-level (US) highway systems of a lower rank, which need not consist mainly of controlled-access highways.
 
== United States and Canada ==
[[File:Us-vmt-by-functional-system.png|thumb|440px|[[Vehicle miles of travel]] by highway functional system in the US]]