[jsprogrammer]

Yes, but that requires a fixed machine (or a cash lock box on every vehicle?).

Shouldn't I be able to just leave the car anywhere in a city?

[homogeneous]

> Yes, but that requires a fixed machine (or a cash lock box on every vehicle?).

Of course not. Do it exactly like how rentals work today except in an app instead of in person. Put in your bank card info, a hold is placed on your card, when the vehicle is returned the hold is released and the service fee is charged.