The Cairo Metro is one of the busiest metro systems globally, carrying millions of passengers every day. The Cairo Metro was inaugurated on September 27, 1987, making it the first metro system in both Africa and the Arab world. The Cairo Metro has 74 stations, including 4 transfer stations, for a total length of 93.1 kilometers (57.8 mi). The metro consists of three lines: Red, Blue and Green, which connect different parts of Cairo. The Cairo Metro's status as Africa's first metro underlines its historical importance in the development of urban transit on the continent.