Wait what? MTA....that is completely and utterly useless. When I lived in Chicago they used that sh*t all the time. If the door closed before you got off at your stop (pull it-doors open-you get off). If you accidentally got on an empty train to realize the the red line smelly bum was the reason it was empty (pull it-doors one-you get off). Sh***t, if you get on and realized to want to take a cab.....you get the point. But in all actuality, when you waiting in the Chi-town cold 15 feet in the air above ground, you are praying to be on a train with the doors closed.