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List of Interstate Highways. 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. Typically, odd-numbered Interstates run ...
- June 29, 1956
- Interstate X (I-X)
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The system extends throughout the contiguous United States and has ...
- June 29, 1956; 67 years ago
- 48,756 mi (78,465 km)
- Interstate X (I-X)
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Feb 17, 2022 · East-west highway systems all end with "0" and are numbered increasingly higher as you progress further north. For example, I-10 runs through the southernmost states (California, Arizona, New ...
The Interstate numbering plan was based on the plan used to number the U.S. numbered highways, but in mirror image (for example, U.S. 1 is on the East Coast, while I-5 is on the West Coast; U.S. 10 is in the north while I-10 is in the south).
Mar 16, 2024 · Interstate Highway System, a network of public highways established across the United States by federal law. Though highways existed in the United States before the creation of the Interstate Highway System, the passage of the Federal-Aid Highway Act of 1956 funded the construction of more than 40,000 miles (65,000 km) of roads and established ...
- Stephen Eldridge
The sign used to mark an interstate. 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 and bigger numbered routes in the north .
Sep 15, 2019 · IHS today Source: SPUI/Wikimedia Commons. Today, the Interstate Highway System is comprised of 68,000 km (42,00-miles) of roadway. It was initially estimated to cost $25 billion and take 12 years ...
