Off-duty Queens cop’s tourniquet saved life of motorcyclist in BQE crash

A Queens cop on her way to work rescued a badly-bleeding motorcyclist in a hit-and-run crash on the Brooklyn-Queens Expressway.

Officer Mandeep Kaur was driving in her personal car to the 114th Precinct in Astoria when she spotted the woman on the eastbound shoulder of the highway, near Exit 43…