The 14th Street Crosstown Line is a public transit line in Manhattan, New York City, running primarily along 14th Street from Chelsea or the West Village to the Lower East Side. Originally a streetcar line, it is now the M14 bus route, operated by the Manhattan and Bronx Surface Transit Operating Authority. The line's two variants, the M14A SBS and M14D SBS, use Avenue A and Avenue D respectively from 14th Street south into the Lower East Side.