Proposed by 1986 but never built; shown in the document as TN 399, which was probably not the designation for this road because the current one was created around the same time[3]
Former portion of SR 34; decommissioned when US 421 was rerouted off of this road; now MLK Jr Boulevard; still on official maps through 2017, but off functional maps by 2014
Proposed I-75 bypass of Knoxville, also proposed to be extended to I-40 at exit 407 (SR 66) to provide a complete northern beltway of Knoxville and provide a more direct route to Sevier County/Great Smoky Mountains National Park