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  2. List of Interstate Highways - Wikipedia

    en.wikipedia.org/wiki/List_of_Interstate_Highways

    There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. 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 ...

  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. Glossary of road transport terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_road_transport...

    See three-way junction 5-1-1 A transportation and traffic information telephone hotline in some regions of the United States and Canada that was initially designated for road weather information. A Access road See frontage road Advisory speed limit A speed recommendation by a governing body. All-way stop or four-way stop An intersection system where traffic approaching it from all directions ...

  5. Interstate Highway standards - Wikipedia

    en.wikipedia.org/wiki/Interstate_Highway_standards

    The bridge was designed before the start of the Interstate Highway System, and it was grandfathered into the system. [7] Interstate 93 super two through Franconia Notch, New Hampshire. Interstate 93 through Franconia Notch, New Hampshire is also a notable exception, being a super two parkway with a speed limit of 45 mph (72 km/h).

  6. American Association of State Highway and Transportation ...

    en.wikipedia.org/wiki/American_Association_of...

    The contract will specify AASHTO Test Designation T 22, "Compressive Strength of Cylindrical Concrete Specimens," as the means of determining compressive strength. The laboratory performing T 22 will be required to be accredited in that test. AASHTO coordinates the numbering of Interstate Highways, U.S. Highways, and U.S. Bicycle Routes.

  7. List of gaps in Interstate Highways - Wikipedia

    en.wikipedia.org/wiki/List_of_gaps_in_Interstate...

    I-70 briefly follows an at-grade portion of US 30 with traffic lights in Breezewood, Pennsylvania. There are gaps in the Interstate Highway System where the roadway carrying an Interstate shield does not conform to the standards set by the Federal Highway Administration (FHWA), the body that sets the regulations for the Interstate Highway System.

  8. Driving in the United States - Wikipedia

    en.wikipedia.org/wiki/Driving_in_the_United_States

    Driving while intoxicated with alcohol is illegal in all U.S. jurisdictions. Most U.S. vehicles have a semi-automatic transmission; only 3.9 percent have a manual transmission. [3] [4] The U.S. has an extensive system of highways, including the National Highway System begun in the early 20th century and the Interstate Highway System planned in ...

  9. List of auxiliary Interstate Highways - Wikipedia

    en.wikipedia.org/wiki/List_of_auxiliary...

    Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a subset of highways within the United States' Interstate Highway System.The 323 auxiliary routes generally fall into three types: spur routes, which connect to or intersect the parent route at one end; bypasses, which connect to the parent route at both ends; and beltways, which form a circle that intersects the ...