State Route 115

State Route 115 (SR 115) is the hidden state route that overlaps the entire route of US 129 in the state of Tennessee. The highway is 52.8 miles (85 km) long and is located entirely in East Tennessee. It begins in Blount County and ends in Knox County. It is completely unsigned, with the exception of mileposts, with the highway being solely signed as US 129.​

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Length of Route
52.8 mi.

Begins:
US 129 at the North Carolina state line in Deals Gap​

Ends:
I-40 in Knoxville​

Counties Covered:
Blount, Monroe, Knox​

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