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 New York City Transit 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.