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In 1918, Wisconsin became the first state to number its highways in the field followed by Michigan the following year. [1] In 1926 the American Association of State Highway Officials (AASHO) established and numbered interstate routes (United States Numbered Highways), selecting the best roads in each state that could be connected to provide a national network of federal highways.
In the 1950s, the numbering grid for the new Interstate Highway System was established as intentionally opposite from the US grid insofar as the direction the route numbers increase. Interstate Highway numbers increase from west-to-east and south-to-north, to keep identically numbered routes geographically apart in order to keep them from being ...
These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, even-numbered Interstates run east–west, with lower numbers in the south and higher numbers in the north; odd-numbered Interstates run north–south, with lower numbers in ...
Diagram of how the FHWA assigns numbers to different types of interstate routes: Date: 18 February 2008: ... Interstate Highway System; Usage on pt.wikipedia.org
The same route marking policy applies to both US Numbered Highways and Interstate Highways; however, business route designations are sometimes used for Interstate Highways. [70] Known as Business Loops and Business Spurs , these routes principally travel through the corporate limits of a city, passing through the central business district when ...
The highway types covered by this convention have two naming formats – official name and article title – which can be the same. The official name is the naming format typically used by the state department of transportation (DOT) or the general public, and is what should be used to refer the highway in article prose.
Since the policy on numbering and designating US Highways was updated in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 300 miles (480 km) in length, "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials ...
Straight-line diagrams (SLDs) are available for all Interstate and U.S. Highways, State Roads, and County Routes (organized by county). Note that various parts of some highways may be assigned different reference numbers within the same county, whether or not they are continuous segments (especially if highways are concurrent with one another).