The Kheel Plan... read it.

...under the Kheel Plan, as we call it, when you get on a bus, you don't have to pay a fare. Not only is that nice for you, but it speeds up everybody's ride -- no more fumbling at the door for your fare card. This in turn makes the buses more attractive to people who might otherwise drive or take cabs, which makes for less traffic, which speeds bus travel and attracts still more riders. Where will the buses come from to handle the load? They're here now; the numbers tell us that buses will be able to make six runs in the time it now takes them to do five...

must reading for all transit advocates and environmentalists