About: M15 (New York City bus)

The First and Second Avenues Line, also known as the Second Avenue Line, is a bus line in Manhattan, New York City, running mostly along Second Avenue (and northbound on First Avenue since 1951) from Lower Manhattan to East Harlem. Originally a streetcar line along Second Avenue, it is now the M15 bus route, the busiest bus route in the city, carrying over 8.1 million people annually. MTA Regional Bus Operations, under the New York City Bus and Select Bus Service brands, operates the local out of the Tuskegee Airmen Bus Depot and the SBS from the Mother Clara Hale Bus Depot. Service is operated exclusively with articulated buses.