The Lexington Bypass was planned as a continuation of the widening and improvements to US 412 between Lexington and
Columbia, which was initiated by the Better Roads Program by Tennessee Governor
Lamar Alexander in 1986. Right-of-way plans were finalized in 2007. The contract for the first phase of the bypass between US 412 and SR 22 was awarded on December 23, 2019, and construction began in March 2020. In addition to the construction of the new road, the section of US 412 at the intersection of the bypass was reconfigured to allow direct flow onto the bypass from the westbound lanes. The northern terminus of SR 200 was also truncated from SR 22A to SR 459 and the former northern terminus modified; the former section of SR 200 north of SR 459 was turned over to local control. The road was expected to be complete in October 2022, but experienced many delays, and did not open until June 29, 2023. The route cost approximately $37 million to construct. SR 459 is planned to be extended east to US 412 east of Lexington. ==Major intersections==