Park-to-Park Highway, from Yellowstone to Glacier National Park via Missoula.
Potash Highway, from Grand Island to Alliance, Neb.
Rainbow Trail, from Pueblo to Grand Junction, Colo., 238 miles.
Red Ball Route (marked with red ball), from St. Paul, Minn., to St. Louis, Mo., 487 miles. [[180]]
River-to-River Road (white, black and letter R.), across Iowa from Davenport to Omaha, 349 miles.
Robert E. Lee Highway, from New Orleans to San Diego.
Scott Highway, from Duluth, Minn., to Fort William and Port Arthur, 210 miles.
Southwest Trail (black letters S. W. on white bands), from Chicago to Laredo, Tex., 1,706 miles.
Utah-Idaho-Yellowstone Highway, from Salt Lake City to West Entrance of Yellowstone Park, 360 miles.
Waubonsie Trail (black, white and black bands), across Iowa from Keokuk to Lincoln, Neb.