There are 70 primary Interstate Highways in the Interstate Highway System, a network of controlled-access freeways in the United States. .. official Interstate Highway designations. Many of the territory's routes are freeway-standard toll roads.
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly The United States government's efforts to construct a national network of .. From to , the maximum speed limit on any highway in the United States was 55 miles per hour (90 km/h), in accordance with federal law.
The Wikipedia answer given elsewhere is incomplete in that it only lists “primary” interstate routes (those that have 1 or 2 digits) such as I-4 and I It does not.
Learn about U.S. highway system statistics, including the shortest and longest cross-country routes, states with the most interstate mileage, most costly routes.
A look at America's longest interstate highways, a system that changed a nation on wheels.
Last Christmas some million people were expected to drive more than fifty miles from their homes. With gas prices falling and the weather.
In , Henry Ford introduced the Model T, a dependable, affordable car that soon found its way into many American garages. By , the.