Location: US-45 and Old US-45, McNairy Cty Reassurance shield as 45 enters Tennessee. 45 and its branches are mostly divided highway throughout western Tennessee. Location: US-45 and Old US-45, McNairy Cty Reassurance shield about a mile into the Volunteer State. Location: US-45 and Smith Store Rd, McNairy Cty Reassurance shield a mile or so later. … Continue reading U.S. Route 45, TN-5/MS State Line to TN-57