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  2. Numbered highways in the United States - Wikipedia

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

    The Interstate Highway System is a federally funded and administered but state-maintained system of freeways that forms the transportation backbone of the United States, with millions of Americans relying on it for commutes, long-distance travel, and freight transport daily, among other things.

  3. Controlled-access highway - Wikipedia

    en.wikipedia.org/wiki/Controlled-access_highway

    Unlike in some jurisdictions, not all freeways in the US are part of a single national freeway network (although together with non-freeways, they form the National Highway System). For example, many state highways such as California State Route 99 have significant freeway sections. Many sections of the older United States Numbered Highway ...

  4. United States Numbered Highway System - Wikipedia

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

    In 1925, the Joint Board on Interstate Highways, recommended by the American Association of State Highway Officials (AASHO), worked to form a national numbering system to rationalize the roads. After several meetings, a final report was approved by the U.S. Department of Agriculture in November 1925.

  5. Road hierarchy - Wikipedia

    en.wikipedia.org/wiki/Road_hierarchy

    Bundesautobahn 9 near by Garching bei Muenchen, Germany. At the top of the hierarchy in terms of traffic flow and speed are controlled-access highways; their defining characteristic is the control of access to and from the road, meaning that the road cannot be directly accessed from properties or other roads, but only from specific connector roads.

  6. Interstate Highway System - Wikipedia

    en.wikipedia.org/wiki/Interstate_Highway_System

    As of 2022, about one quarter of all vehicle miles driven in the country used the Interstate Highway System, [6] which has a total length of 48,890 miles (78,680 km). [2] In 2022 and 2023, the number of fatalities on the Interstate Highway System amounted to more than 5,000 people annually, with nearly 5,600 fatalities in 2022. [7]

  7. National Highway System (United States) - Wikipedia

    en.wikipedia.org/wiki/National_Highway_System...

    The National Highway System (NHS) is a network of strategic highways within the United States, including the Interstate Highway System and other roads serving major airports, ports, military bases, rail or truck terminals, railway stations, pipeline terminals and other strategic transport facilities. Altogether, it constitutes the largest ...

  8. Limited-access road - Wikipedia

    en.wikipedia.org/wiki/Limited-access_road

    The Veterans Memorial Parkway in London, Ontario is a modern at-grade limited-access road with intersections. A limited-access road, known by various terms worldwide, including limited-access highway, dual-carriageway, expressway, and partial controlled-access highway, is a highway or arterial road for high-speed traffic which has many or most characteristics of a controlled-access highway ...

  9. Exit numbers in the United States - Wikipedia

    en.wikipedia.org/wiki/Exit_numbers_in_the_United...

    (These exits are based on internal limited-access road mileage; see State highways in Oregon for an explanation on these differences.) Pennsylvania's non-Interstate highways that have numbered exits are still numbered sequentially (such as the freeway portion of PA 28 between Pittsburgh and Kittanning) with the exception of the toll roads that ...