U.S. Highway 40 (US 40) is a major east–west United States Highway extending across the United States from the Mid-Atlantic to the Mountain States. As with most routes ending in a zero, US 40 once traversed the entire United States. It is one of the first U.S. Highways created in 1926 spanning from San Francisco, California to Atlantic City, New Jersey. The route was built on top of several older highways, most notably the National Road/Cumberland Road. Built between 1811 and 1837, the National Road was the first major improved highway in the United States built by the federal government. In the western United States, US 40 has been replaced by Interstate 80, resulting in the route being truncated multiple times. US 40 currently ends at a junction with I-80 in Silver Summit, Utah, near Salt Lake City.
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