Alabama State Route 66

State Route 66 (SR 66) is a 9.291-mile-long (14.952 km) state highway in the west-central part of the U.S. state of Alabama. The western terminus of the highway is at an intersection with SR 28 at Consul, an unincorporated community in eastern Marengo County. The eastern terminus of the highway is at an intersection with SR 5 near the unincorporated community of Safford, in western Dallas County.

U.S. Route 31 (US 31) is a major north–south U.S. Highway running through the central United States. It begins in southern Alabama at an interchange with US 90 and US 98 in Spanish Fort, near Mobile, and extends northward through Alabama, Tennessee, Kentucky, and Indiana before terminating in Michigan. The highway runs for about 1,280 miles in total.

In Alabama, US 31 parallels Interstate 65 for most of its length, connecting cities like Montgomery, Birmingham, and Decatur. Entering Tennessee, it splits into US 31E and US 31W near Nashville, with both branches rejoining near Louisville, Kentucky. US 31 then travels north through Indiana, passing Indianapolis, Kokomo, and South Bend. Crossing into Michigan, the highway continues along the eastern shore of Lake Michigan, serving cities such as Benton Harbor, Holland, and Muskegon, before ending in Mackinaw City at Interstate 75, just south of the Mackinac Bridge.

Historically, US 31 was one of the original U.S. Highways established in 1926 and served as a primary north–south corridor before the Interstate Highway System was built. Today, while Interstate 65 and other highways carry much of the long-distance traffic, US 31 remains an important regional route, providing access to smaller communities, business districts, and scenic areas along its path.