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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.
Special routes, which can be labeled as alternate, bypass or business, depending on the intended use, provide a parallel routing to the mainline U.S. Highway. Before the U.S. Routes were designated, auto trails designated by auto trail associations were the main means of marking roads through the United States. These were private organizations ...
The Intermodal Surface Transportation Efficiency Act (ISTEA) in 1991 established certain key routes such as the Interstate Highway System, be included. [1] [2] The act provided a framework to develop a National Intermodal Transportation System which "consists of all forms of transportation in a unified, interconnected manner, including the transportation systems of the future, to reduce energy ...
These routes do not have to comply to Interstate construction or limited-access standards but are routes that may be identified and approved by the association. 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]
Primary routes (i.e. major thoroughfares) have 5 or 0 as their last digit, while secondary routes end in other digits. Branch routes have three-digit route numbers, where the first two digits match the route number of an arterial route. This differs from the American system, whose last two digits match the primary route.
Route numbers divisible by 5 usually represent major coast-to-coast or border-to-border routes (ex. I-10 connects Santa Monica, California to Jacksonville, Florida, extending between the Pacific and Atlantic oceans). Auxiliary highways have an added digit prefixing the number of the parent highway.
Interstate 26. Connecting directly from I-81, I-26 offers another major corridor for travel between East Tennessee and the Carolinas. Motorists can use this route to travel south from I-81 toward ...
States may choose a design theme relevant to its state (such as an outline of the state itself) to distinguish state route markers from interstate, county, or municipal route markers. The longest state highway in the United States is Montana Highway 200 .