Arizona | Interstate Highways | U.S. Routes | Highways 51-99 | Highways 101-587 | This starts at the northwestern corner of the state and moves clockwise around it Utah State Line:   (St George, UT) Second to last reassurance shield in Utah- the POE is shared between AZ and UT. AZ State Line, Welcome to Arizona!, Bicentennial sign, … Continue reading State Line Crossings