Several special routes of U.S. Route 20 exist. In order from west to east, they are as follows.
Center Street—Douglas, WY
Interstate 25 in Wyoming
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Interstate 25 is a part of the Interstate Highway System that runs from Las Cruces, New Mexico, to Buffalo, Wyoming. In Wyoming, the Interstate Highway runs 300.530 miles from the Colorado state line
Special routes of U.S. Route 20
…26 Business in the Casper, Wyoming area is a concurrent business spur that goes from the intersection of US 20, US 26, and SR 257 in Mountain View to I-25 in Casper, following 1st Street and Yellowstone Street. It is also partially concurrent with I-25 Business and US 87 Business. The entire route is in…
I-25 bridge over the North Platte River at Douglas
I-25 south of Buffalo