Original: The Dwight D. Eisenhower National System of Interstate and Defense Highways , commonly called the Interstate Highway System ( or simply , the Interstate System ) , is a network of limited-access highways ( also called freeways or expressways ) in the United States that is named for President Dwight D. Eisenhower , who championed its formation .
Simplified: The Dwight D. Eisenhower National System of Interstate and Defense Highways ( often called the Interstate Highway System , Interstate or I - ) , is a group of roads in the United States .