Maximum taxi service fee
This probably isn't likely to be exploited anytime soon, but the maximum fee for a cab ride is 200 chips. I don't know if that's hard-coded somewhere, but it would probably be good to remember if you ever decide to modify that or re-use the code that calculates the fare.
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That’s a deliberate cap. When the city gets larger we don’t want it too difficult to travel between distant casinos. Fortunately, there’s no real incentive to exploit that cap.