 Although I will say New York City's implementation is the best I've found because you do not need to do anything special. They made it so that if you have a credit card or a debit card set up on your phone as tap to pay, that serves as your ticket to ride the subway. All you do is tap and go. And if you ride it like a certain amount of times, like let's say nine times in a week, there's like a cutoff. They will then just bill you the flat rate for that week. So you're not getting overcharged if you take it a bunch. So I thought New York City did a really nice job there.