U.S. Route 20
U.S. Highway 20 (US 20) is an east–west United States highway that stretches from the Pacific Northwest all the way to New England. The "0" in its route number indicates that US 20 is a coast-to-coast route. Spanning , it is the longest road in the United States, and particularly from Newport, Oregon to Boston, Massachusetts, 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. There is a discontinuity in the official designation of US 20 through Yellowstone National Park, with unnumbered roads used to traverse the park.
Montana Highway 200
Montana Highway 200 (MT 200) in the U.S. state of Montana is a route running east-west covering the entire state of Montana. From the starting point at ID 200, near Heron, Montana the highway runs east to ND 200 near Fairview, Montana. It is part of a chain of state highways numbered "200" which extend from Idaho across Montana, North Dakota and Minnesota. Montana Highway 200 is also the longest route signed as a state highway in the United States.
Highway 200 helps to connect many small towns located in central Montana and the vast plains area of eastern Montana, to larger western Montana cities such as Great Falls and Missoula.