"Currently, when commuters enter or exit the turnstiles, it’s generally a mad rush. In the middle of rush hour, it’s an even bigger pain.
"Using rider data, we could figure out when these “rushes” happen, and by utilizing LEDs and locking turnstiles, we could make exiting riders go through one lane, versus three.
"This could also work in reverse…if more riders exit then enter, depending on data, the lighting could be different, and the turnstile could be locked the other way.
"(Thanks to William Wong for the inspiration.)
Image and text provided by Randy Gregory II's "100 Improvements to the New York Subway".