Appalachian Development Highway System in the context of "Tennessee State Route 32"

U.S. Route 25 or U.S. Highway 25 (US 25) is a north–south United States Numbered Highway that runs for 750 miles (1,210 km) in the Southern and Midwestern U.S. Its southern terminus is in Brunswick, Georgia, from where it proceeds mostly due north, passing through the cities of Augusta, Georgia; Greenville, South Carolina; and Asheville, North Carolina, before dividing into two branches, known as US 25W and US 25E between Newport, Tennessee, and North Corbin, Kentucky. After passing through Richmond and Lexington, Kentucky, it reaches its northern terminus at Ohio state line in Covington, Kentucky. The route is an important crossing of the Appalachian Mountains, and it is covered by three of the corridors of the Appalachian Development Highway System (ADHS). When the highway was originally established in 1926, the route extended from North Augusta, South Carolina, to Port Huron, Michigan. The southern end was extended to its current terminus in 1936, while the northern end was truncated in 1974.

Interstate 26 (I-26) is a main route of the Interstate Highway System in the Southeastern United States. Nominally east–west, as indicated by its even number, I-26 runs from the junction of US Route 11W (US 11W) and US 23 in Kingsport, Tennessee, generally southeastward to US 17 in Charleston, South Carolina. The portion from Mars Hill, North Carolina, east (compass south) to I-240 in Asheville, North Carolina, has signs indicating FUTURE I-26, because the highway does not yet meet all of the Interstate Highway standards.

Northward from Kingsport, US 23 continues to Portsmouth, Ohio, as Corridor B of the Appalachian Development Highway System, and beyond to Columbus, Ohio, as Corridor C. In conjunction with the Columbus–Toledo corridor in Ohio formed by I-75, US 23, and State Route 15 (SR 15), I-26 forms part of a mostly high-speed four-or-more-lane highway from the Great Lakes to the Atlantic Coast at Charleston, South Carolina.