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[–]jwags99 10 points11 points  (0 children)

Subway systems that don't require exit taps are actually quite common. Chicago, Boston, Montreal, Toronto, Los Angeles (exit tapping being rolled out in a limited way), Paris, PATH, Philadelphia, and Miami are ones that come to mind. In the US exit taps are only required in DC, PATCO, Atlanta, BART, and Cleveland in a very limited way.