What is the main highway in America?

The “0” in its route number indicates that US 20 is a coast-to-coast route and a major route. Spanning 3,365 miles, it is the longest road in the United States, and the route is roughly parallel to that of the newer Interstate 90 (I-90), which is, in turn, the longest Interstate Highway in the U.S.



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Route 66 has gained a reputation as the United States of America's most famous road.

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Route 66 became a popular route because of the active promotion of the U.S 66 Highway Association, which advertised it as “the shortest, best and most scenic route from Chicago through St. Louis to Los Angeles.”

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As with the Grand Canyon, Las Vegas isn't considered part of the original Route 66. But, it's a city you might be keen to experience at least once, and it's close enough (five hours' drive) to the canyon. En route is Seligman, a classic Route 66 town of traditional motels, diners, shops and flashing neon signs.

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Route 66's popularity led to its downfall, with traffic swelling beyond its two-lane capacity. In 1956, legislation created the Interstate System, and over the course of three decades, five separate interstates bypassed segment after segment of Route 66.

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During this time, it also became one of the key routes for moving military equipment across the country. Due to the efforts of the U.S. Highway 66 Association, Route 66 became the first highway to be completely paved in 1938. In the 1950s, Route 66 became the main highway for vacationers heading to Los Angeles.

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King's Highway was built from 1650 to 1735 decades before the United States became a country, making it the oldest road in America. The Texas Department of Transportation notes Kings Highway as the oldest highway in the United States.

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