The routes in the America's Byways® collection vary not only in geography and landscape character, but also in length, ranging from less than 10 miles to more than 1,000 miles (Figure 4 ). At the upper end of this range are Alaska's Marine Highway, with 3,500 miles of ferry routes, and two multi-State routes - the Great River Road (2,069 miles) and Historic Route 66 (1,410 miles—non-contiguous). At the other extreme, the Las Vegas Strip is only five miles long, and two other byways are shorter than ten miles: Red Rock Scenic Byway (eight miles) and the Arroyo Seco Parkway (nine miles). The median length of the 126 byways is 85 miles, and half of the designated byways are between 46 and 165 miles in length.
Figure 4 : Lengths of Designated Byways
Both the website of the Alaska Marine Highway System and America's Byways state that the Alaska's Marine Highway All-American Road is "over 3,500 miles" long, but other sources give different figures:
According to America's Byways, "the Great River Road National Scenic Byway incorporates riverside roads in six of the ten states that border the Mississippi River: Arkansas, Illinois, Iowa, Minnesota, Mississippi, and Wisconsin." These six State byways total 2,200 miles in length. However, the official list of America's Byways® includes Missouri's Little Dixie Highway of the Great River Road as a separate byway and not as part of the multi-State Great River Road. The five remaining State segments total 2,069 miles in length.^ back