The Complex History of the U.S. Interstate Highway System

US Map with States and Cities, List of Major Cities of USA

15 BEST USA Road Trips of a Lifetime

12 best places to visit in the USA - Lonely Planet

This Simple Map of the Interstate Highway System Is Blowing People’s Minds

An Explanation of the Often Confusing US Interstate Highway Numbering Conventions

U.S. Interstate Highways, as a Transit Map