The Metropolitan Transportation Authority (MTA) operates 80 express bus routes in New York City, United States. Generally, express routes operated by MTA Bus Company are assigned multi-borough (BM, BxM, QM, SIM) prefixes. Exceptions to this rule are 7 Brooklyn and Queens express routes operated by MTA New York City Transit. Those routes use an X prefix. Express buses operate using over-the-road diesel-powered, 45-ft-long coaches, from Motor Coach Industries and Prevost Car. See also: MTA Regional Bus Operations Bus Fleet