Auxiliary route

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In road transportation, an auxiliary route is either a spur or a loop of a parent route. The auxiliary route, sometimes called a "child route", is typically distinguished from its parent with either a specific numbering scheme (e.g. Interstate 240 is an auxiliary route of Interstate 40 in the United States) or the use of banners like "Business", "City", "Alternate", "Spur", and "By-pass".

Oftentimes the term "spur" is used as a substitute for "auxiliary", but true spurs have a unique characteristic in that they do not normally reconnect to the parent highway once separated.

[edit] See also

• List of auxiliary Interstate Highways