a four-lane undivided highway. SR 431 now splits off along Main Street and US 45 Bus. narrows to two lanes and continues north to leave downtown and pass through a business district. It passes through some neighborhoods before coming to an end at an interchange with SR 22 and US 45E, with unsigned SR 372 continuing north along N Lindell Street and US 45E. State Route 372 State Route 372 (SR 372) is an entirely unsigned north-south state highway in the city of Martin, Tennessee. It serves as the unsigned companion route of US 45E Business, as well as for US 45E between the SR 22 interchange and the SR 43 junction on the north side of the city. References E 45E 45E Transportation in Madison County, Tennessee Transportation in Gibson County, Tennessee Transportation in Weakley County, Tennessee Transportation in Obion County, Tennessee Freeways in Tennessee