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The Tennessee Department of Highways and Public Works was established by the Tennessee General Assembly in 1915 and tasked with constructing, maintaining, and improving roads throughout the state. That year, the 538-mile (866 km) Memphis to Bristol Highway, later State Route 1 , was designated as the first state highway in Tennessee.
In 1915, a State Highway Commission was created to organize transportation services. The original commission consisted of six volunteer members. As responsibilities of the commission grew, this became inadequate, and in 1919 the commission was replaced with three paid members. By 1922, roads in Tennessee were behind surrounding states.
The triangle marker design was the only design until November 1983, when Tennessee divided its routes into primary routes and secondary or "arterial" routes with the adoption of a functional classification system, creating a primary marker and making the triangle marker the secondary marker; primary marker signs were posted in 1984. [2]
The U.S. Highways in Tennessee are the segments of the United States Numbered Highway System that are maintained by the Tennessee Department of Transportation (TDOT) in the state of Tennessee. All of these highways in Tennessee have a state highway designation routed concurrently along them, though the state highway is hidden and only signed ...
[31] [32] Engineering work began in August 1957, [33] and the design for this freeway was jointly approved on July 17, 1958, by the Bureau of Public Roads, predecessor to the Federal Highway Administration (FHWA); and the Tennessee Department of Highways, now the Tennessee Department of Transportation (TDOT). [2]
The longest Interstate Highway in Tennessee is Interstate 40, at a length of 454.81 miles (731.95 km). The segment of I-40 in Tennessee is also the longest segment of all of the states the route traverses. The shortest mainline Interstate Highway in Tennessee is I-55, at a length of 12.28 miles (19.
Built by the Tennessee Department of Transportation (TDOT), it is also designated as Tennessee National Guard Parkway. [3] At 77.28 miles (124.37 km) long, it is the tenth-longest auxiliary Interstate Highway in the nation. [4] The route serves the cities of Lebanon, Murfreesboro, Franklin, and Dickson, all suburbs of Nashville. [5] [6]
The Tennessee Department of Transportation (TDOT) announced plans to build SR 396 on September 11, 1985, for a price of $29.3 million (equivalent to $70.5 million in 2023 [10]) as part of an effort to improve infrastructure around the then-future Saturn Plant, which had been announced three months prior.