U.S. Federal Route 51 is a controlled access highway from the Dyer/Obion County Line to near Troy. From near Troy to the northside of Union City, this is a four-lane highway. North of Union City to near the Kentucky State Line it is a controlled access highway. U.S. Rt. 51 passes through the following town in Obion County. Union City U.S. Rt. 51 is multi-plexed in Obion County. Tennessee State Route 3, through out Obion County. Tennessee State Route 22, at Union City. U.S. Rt. 45W, from near Union City to near South Fulton.
NB U.S. Rt. 51 near the Obion/Dyer County Line. NB U.S. Rt. 51 south of Troy. A BGS on NB U.S. Rt. 51. A BGS on NB U.S. Rt. 45W/51. A BGS on NB U.S. Rt. 45E.