"SR 21 Bus." . "Georgia State Route 21" . "Georgia State Route 21#Port Wentworth alternate route" . "Georgia State Route 21#Springfield spur route" . "South" . . "135828.6336" . "North" . "State Route 21" . "SR 21" . . . . . . . . . "Georgia State Route 21#Garden City spur route" . . . . "SR 21" . "21" . "Georgia State Route 21" . . . "Derenne Avenue" . "Georgia State Route 21#Springfield business loop" . "State Route 21" . . "Georgia State Route 21#Newington business loop" . . . . . "Georgia State Route 21#Sylvania business loop" . "Georgia State Route 21#Sylvania connector route" . . . "State Highway 21" . "SR" . "21" . "Georgia State Route 21#Chatham County spur route" .