840

Interstate 840 (I-840), formerly State Route 840 (SR 840), also designated as Tennessee National Guard Parkway, is a freeway that serves as an outer bypass route around Nashville, Tennessee, built by the Tennessee Department of Transportation (TDOT). At a length of 77.28 miles (124.37 km) long, it is the tenth-longest auxiliary Interstate Highway in the nation. The route serves the cities of Lebanon, Murfreesboro, Franklin, and Dickson, all suburbs of Nashville.First proposed by former Governor Lamar Alexander as part of a system of Bicentennial Parkways, construction began in 1991 and was completed in 2012. I-840 was originally planned as an Interstate Highway, but was constructed entirely with state funds, and as a result was initially designated as a state route. In 2015, approval was given by the Federal Highway Administration (FHWA) and the American Association of State Highway and Transportation Officials (AASHTO) to redesignate SR 840 as I-840 as part of its integration into the Interstate Highway System. On August 12, 2016, TDOT announced that the route had officially been renamed Interstate 840, and that re-signing work would begin.

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