Tennessee State Route 431

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State Route 431 is a secondary state highway in Tennessee. SR 431 runs southeast to northwest from just southeast of Martin in Weakley County to just east of Union City in Obion County.

State Route 431 is the portion of State Route 22, a primary state highway, which was replaced with the current four-land divided, access -controlled section which now parallels the former route to the north. The old portion was then designated State Route 431.

SR 431 is known in Martin west of the downtown area as University Avenue. The campus of the University of Tennessee at Martin is located along University Avenue, which divides it into the main campus area and the agriculture campus, where the football stadium, ROTC, and the rodeo pavillion are located. The Martin Wal-Mart and the communities of Gardner and Midway are also located along this highway, as is an access road to a small general aviation airport.