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  2. List of Interstate Highways - Wikipedia

    en.wikipedia.org/wiki/List_of_Interstate_Highways

    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.

  3. Interstate Highway System - Wikipedia

    en.wikipedia.org/wiki/Interstate_Highway_System

    The Pershing Map FDR's hand-drawn map from 1938. The United States government's efforts to construct a national network of highways began on an ad hoc basis with the passage of the Federal Aid Road Act of 1916, which provided $75 million over a five-year period for matching funds to the states for the construction and improvement of highways. [8]

  4. List of Interstate Highways in Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/List_of_Interstate...

    The list of Interstate Highways in Pennsylvania encompasses 23 Interstate Highways—12 primary routes and 11 auxiliary routes—which exist entirely or partially in the U.S. state of Pennsylvania. In Pennsylvania, most of the Interstate Highways are maintained by the Pennsylvania Department of Transportation (PennDOT).

  5. List of Interstate Highways in Massachusetts - Wikipedia

    en.wikipedia.org/wiki/List_of_Interstate...

    The longest Interstate Highway in Massachusetts is I-90 with 136 miles, followed by I-495 with 121 miles. Several freeway projects in the Boston area planned as part of the Interstate Highway System were cancelled in the 1970s following community opposition , including the Inner Belt (I-695) and Southwest Expressway (I-95). [ 3 ]

  6. United States Numbered Highway System - Wikipedia

    en.wikipedia.org/wiki/United_States_Numbered...

    Though the Interstate numbers were to supplement—rather than replace—the U.S. Route numbers, in many cases (especially in the West) the US highways were rerouted along the new Interstates. [12] Major decommissioning of former routes began with California's highway renumbering in 1964.

  7. List of Interstate Highways in Virginia - Wikipedia

    en.wikipedia.org/wiki/List_of_Interstate...

    The Interstate Highways in Virginia are a total of 1,118 miles (1,799 km) of Interstate Highways in the U.S. state of Virginia. Virginia consists of six primary interstate highways, and 10 auxiliary interstates. In addition, 3 more primary and one auxiliary route are planned or under construction.

  8. Numbered highways in the United States - Wikipedia

    en.wikipedia.org/wiki/Numbered_highways_in_the...

    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.

  9. List of Interstate Highways in Michigan - Wikipedia

    en.wikipedia.org/wiki/List_of_Interstate...

    MDOT is the agency responsible for the day-to-day maintenance and operations of the State Trunkline Highway System, which includes the Interstate Highways in Michigan.. These highways are built to Interstate Highway standards, [6] meaning they are all freeways with minimum requirements for full control of access, design speeds of 50 to 70 miles per hour (80 to 113 km/h) depending on type of ...