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.
U.S. Route 730
US 730 runs in Oregon and Washington and is listed as part of the National Highway System, a system of roads crucial to the nation's economy, defense and mobility, from its western terminus at I-84 east of Boardman to the end of its concurrency with US 395 in Umatilla. As a state highway in both states, the roadway is maintained by the Oregon Department of Transportation (ODOT) and Washington State Department of Transportation (WSDOT). US 730 has the highest designation of any United States Numbered Highway, or U.S. route, and is the shortest highway in the system. The highway is defined by the Washington State Legislature as SR 730, part of the Revised Code of Washington as §47.17.821.