The new fare cards were so badly administered that a moratorium had to be declared on all bus fares.

NPR: In Chile, Commuters Sue City over Transit System

Now he uses the single-fare cards when he's not biking.

WSJ: Message for the MTA

Ben Yee, a 28-year-old Sunset Park resident, said he took to biking when the fare for the unlimited monthly cards went up a couple of years ago.

WSJ: Message for the MTA

First, the cab companies charge the driver a percentage of the fare in order to process the cards.

FORBES: How Taxi Companies Rip Off Their Drivers

One hang-over from introducing contactless bank cards on the buses to pay for your fare, is that some people are being charged on the wrong card.

BBC: London bus contactless system charging wrong cards