S1100 Primary Road U.S. Census Bureau S1200 Secondary Road U.S. Census Bureau S1400 Local Neighborhood Road, Rural Road, City Street U.S. Census Bureau S1500 Vehicular Trail (4WD) U.S. Census Bureau S1640 Service Drive usually along a limited access highway U.S. Census Bureau S1710 Walkway/Pedestrian Trail U.S. Census Bureau S1720 Stairway U.S. Census Bureau S1730 Alley U.S. Census Bureau S1740 Private Road for service vehicles (logging, oil fields, ranches, etc.) U.S. Census Bureau S1750 Private Driveway U.S. Census Bureau S1780 Parking Lot Road U.S. Census Bureau S1820 Bike Path or Trail U.S. Census Bureau S1830 Bridle Path U.S. Census Bureau S2000 Road Median U.S. Census Bureau