State Route 55 is an east–west highway in Middle Tennessee. The road begins at SR 50 in Lynchburg and ends at U.S. Route 70S and SR 380 in McMinnville. The current length is 49.3 mi (79.3 km). SR 55 heads northeast from Lynchburg to Tullahoma as a two-lane road. In Tullahoma, the route runs concurrent with US 41A. From here, SR 55 heads northeast as a multilane highway to Manchester, where it intersects US 41 and Interstate 24 (I-24). The route continues northeast, serving Summitville and Morrison before it reaches McMinnville.

State Route 50 (SR 50) is a west–to–east highway in Middle Tennessee. The road begins near Only and ends in Altamont. The current length is 161.3 miles (259.6 km).