The term D.C. Public Transportation refers to the METRO, Washington's public transportation system. The METRO is a rapid transit system that serves the Washington metropolitan area, including parts of Maryland and Virginia. It consists of six lines, 91 stations, and 117 miles of track. It is the second busiest rapid transit system in the United States, after New York City's subway system. The METRO provides an efficient and affordable way for people to travel around the city.