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Interstate Highway System - Wikipedia
List of Interstate Highways - Wikipedia
Interstate Frequently Asked Questions - FHWA
10 Things You Might Not Know About the U.S. Interstate System
US Road Map: Interstate Highways in the United States
AARoads' Guide to Interstate Highways - Interstate-Guide
The Interstate Highway System ‑ Definition, Purpose & Facts - HISTORY
Best Route to Drive - get the roads between cities
How Interstate Highways Gutted Communities—and Reinforced ... - HISTORY
Map - National I-73/I-74/I-75 Corridor Association