Washington is pedestrian friendly and ranks as one of America’s top ten most walkable cities. The subway system, called Metrorail, is safe, clean and efficient. The D.C. Circulator connects attractions and neighborhoods that aren’t well served by the metro. Metrobus makes convoluted trips and, like taxis, get stuck in gridlock. Parking is impossible and traffic is horrendous. Cycling is a great way to explore the District but traveling by bike on D.C. streets is a harrowing experience for young children. So the best way to get around is a combination of walking, underground and Circulator bus. ON FOOT: The District is divided into four quadrants of unequal size – NW, NE, SW, SE – with the Capital at the center. Of note, most attractions are located in the Northwest quadrant, the largest of the four. Numbered streets run north-south. Lettered streets run east-west. Avenues run diagonally. The same address can be found in all four quadrants hence the importance of the directional marking. METRORAIL: The metro has five colored lines – red, blue, orange, green and yellow. Station entrances are clearly marked with brown pylons capped with the letter M. Route maps are available online and are posted at each station and on every train. Each train displays the name of its farthest destination. Farecards can be purchased at subway station vending machines. The fare, based on the time of day and distance traveled, is deducted from the rider's card upon exit, so hang onto your farecard. Two children aged four and under ride free with each paying adult. Children five and older pay adult fares. Note that the value of the one and seven days passes depends on how often you ride. CITY BUSES: Washington has two bus systems, Metrobus and tourist-friendly D.C. Circulator. Metrobus may not be geared to visitors but covers every corner of the District. The Circulator’s six color coded routes connect attractions and neighborhoods that aren’t served by Metrorail. All D.C. Circulator routes run every ten minutes and cost $1. Exact change is required on both bus systems.