U.S. Route 40 or U.S. Highway 40 (US 40), also known as the Main Street of America, is a major east–west United States Highway traveling across the United States from the Mountain States to the Mid-Atlantic States. As with most routes whose numbers end in a zero, US 40 once traversed the entire United States. It is one of the first U.S. Highways created in 1926 and its original termini were in San Francisco, California, and Atlantic City, New Jersey. US 40 currently ends at a junction with I-80 in Silver Summit, Utah, just outside Salt Lake City. West of this point US 40 was functionally replaced with I-80, and as these segments of I-80 were constructed the western portion of US 40 was truncated several times.
The western terminus of US 40 at I-80 in Silver Creek Junction
Colfax Avenue carries US 40 through Denver
US 40 crossing the Great Plains in Kansas
The Daniel Boone Bridge carries US 40 across the Missouri River.
U.S. Route 66 or U.S. Highway 66 was one of the original highways in the United States Numbered Highway System. It was established on November 11, 1926, with road signs erected the following year. The highway, which became one of the most famous roads in the United States, ran from Chicago, Illinois, through Missouri, Kansas, Oklahoma, Texas, New Mexico, and Arizona before terminating in Santa Monica in Los Angeles County, California, covering a total of 2,448 miles (3,940 km).
A remnant of an original state right-of-way marker serves as a reminder of the early days of the road's construction. This was part of the 1927 construction of US 66.
Modern 'historic' signage in Chicago
The Chain of Rocks Bridge across the Mississippi River was built to carry the growing traffic of US 66 around the city of St. Louis.
Restored Magnolia gasoline station museum on Route 66 in Shamrock in Wheeler County, Texas
