TN 3 Loop: A new bypass around the south and east of Union City appears on topos and aerials between 1951-54 (appeared in route log starting 1958) as TN 3 Byp. However, county maps through at least 1963 show this as TN 3 Loop. By 1970, they showed it as TN 3 Byp.
Today it is part of TN 184.