Copenhagen Metro is a rapid transit system serving Copenhagen, Fredericksburg and Tamby in Denmark. The metro has 22 stations, 9 of which are located underground. Last year, Copenhagen carried 55 million passengers. The 12.7 mile-long system opened between 2002 and 2007, and has two lines, M1 and M2. The driverless light metro supplements the larger S-train rapid transit system, and is integrated with DSB local trains and Movia buses.