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Which US states have interstate highways?
Which states are on a US road map?
What is the US Interstate Highway System?
How many primary and auxiliary highways are there?
Oct 21, 2023 · This US road map displays major interstate highways, limited-access highways, and principal roads in the United States of America. It highlights all 50 states and capital cities, including the nation’s capital city of Washington, DC. Both Hawaii and Alaska are inset maps in this US road map.
This map shows the Interstate highways in the contiguous US, color-coded by route number and type. (Alaska, Hawaii, and Puerto Rico also have Interstate highways, but use separate numbering systems.) This map uses publicly available data from OpenStreetMap displayed using Mapbox GL JS .
Usually, one- and two-digit routes are major routes, and three-digit routes are numbered as shorter spur routes from a main route. Odd numbers generally increase from east to west; U.S. Route 1 (US 1) follows the Atlantic Coast and US 101 follows the Pacific Coast.
- November 11, 1926
- U.S. Highway nn (US nn), U.S. Route nn (US nn)
- 157,724 mi (253,832 km)
There are 70 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.
- June 29, 1956
- Interstate X (I-X)
Primary Interstate Highways are the major interstate highways of the United States and have a one or two-digit route number. Even (0, 2, 4, 6, or 8) route numbers are given to east/west routes, with the smaller numbered routes in the south ( I-10) and bigger numbered routes in the north ( I-90 ).
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.
May 27, 2010 · The Federal-Aid Highway Act of 1956 was signed into law by President Dwight Eisenhower on June 29, 1956. The bill created a 41,000-mile system of interstate highways that Eisenhower promised would ...
