NYC testing lasers that detect when people fall onto subway tracks
The Metropolitan Transportation Authority (MTA) is testing motion sensor lasers, thermal imaging, intelligent video software, and radio frequencies to determine the best method of detecting when a person falls onto the subway tracks.
The lasers would beam across the tracks, Mission Impossible-style. When the beams are interrupted by a body, it triggers an alarm that will stop oncoming trains. The radio frequencies would work similarly. Thermal imaging would detect body heat on the tracks, and the smart video software installed in the closed-circuit cameras would recognize when a large object moves from the platform to the tracks.