. . "121" . "Texas State Highway 121#Sam Rayburn Tollway" . "SH 121" . . . . . . "State Highway 121" . . . . "Texas State Highway 121" . "SH" . . "Texas State Highway 121#Lewisville" . . "Southwest" . . "Northeast" . "Texas State Highway 121" . . . "Texas State Highway 121#Business routes" . . . . . "Sam Rayburn Tollway" . . "137700.300672" . . . . . "SH 121" . "Texas State Highway 121#Randolph" . . "State Highway 121" . "Texas State Highway 121" . "SH121" .