If mass transit bus money machines (bill or coin slots, card slots, etc.) are out of order or otherwise are not to be used, the bus drivers should be required to place specially made brightly colored plastic covers over any non-functioning part so that it firmly stays in place and logically lets people know not to even try to insert bills or coins. This would eliminate a lot of confusion for passengers and reduce the need for the driver to continually tell boarding bus riders that the machine is broken.