Interstate 124

Interstate 124 (I-124) is an unsigned auxiliary Interstate Highway located in Chattanooga, Tennessee. At a length of 1.92 miles (3.09 km), the route is concurrent with U.S. Route 27, and forms the southernmost section of a much longer freeway that runs from Interstate 24 and provides access to Dayton and Dunlap to the north. The route also serves as a spur route to downtown Chattanooga.

I-124 was constructed in the late 1950s. Since the late 1980s, the route has been unsigned, and marked on signs and mile markers as US 27, The Tennessee Department of Transportation official map no longer designates it as I-124, but some DOT publications still make reference to the designation, and its exit numbers remain. The entire highway was reconstructed and expanded between 2015 and 2021 as part of a larger plan to modernize the roadway.