The new subway turnstiles originally had just round bars. Then the curved fins were attached to make it more difficult for people to hp over by balancing off the bar. The most recent addition is the steel sheet between the turnstiles with the sawtooth top, to keep people form jumping over by pushing up off the sides.
One solution is what’s known as a high-gate turnstile, but those are difficult for people with mobility issues to navigate, so they can’t be the only entry.
Supposedly the future is high door-type gates rather than turnstiles. We shall see.
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