What is freeway mas largo de usa?

The longest freeway in the USA is I-90, also known as the "Dwight D. Eisenhower National System of Interstate and Defense Highways". It spans across 3,101 miles from Boston, Massachusetts to Seattle, Washington, crossing through 13 different states. The construction of I-90 began in 1956 and was completed in 1985, at an estimated cost of $25 billion. It is a major transportation route for both commercial and personal vehicles, connecting many cities and towns throughout the country.