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.
Texas State Highway 99
State Highway 99, also known as the Grand Parkway, is a highway in Texas, United States that opened its first section in 1994. When State Highway 99 is complete, it will be the longest beltway in the U.S., and the third (outer) loop within Houston–The Woodlands–Sugar Land metropolitan area, with Interstate 610 being the first (inner) loop, and Beltway 8 (Sam Houston Tollway) being the second (middle) loop. The proposed loop has been divided into 11 separate segments for construction and funding purposes.