 X- routes are operated by New York City Transit, while BM-routes are operated by MTA Bus Company.All routes operate nonstop between Brooklyn and Manhattan via the Gowanus Expressway or Prospect Expressway to the Hugh L. Carey Tunnel, with some routes continuing non-stop via the FDR Drive to reach Midtown.The exception to this is the BM5, which also makes stops in Queens and uses the Long Island Expressway and Queens Midtown Tunnel to reach Midtown.