Pay and display systems differ from road-side parking meters in that one machine can service multiple vehicle spaces, resulting in lower set up costs. In addition, this system theoretically prevents drivers from taking advantage of parking meters that have time remaining; this factor alone has doubled parking revenues in cities that have switched to pay and display. (A driver may occasionally take advantage of remaining time should a departing parker give away a ticket with remaining time, however.)
Pay and Display Machines
In addition, pay and display machines can also accept a wider variety of coins, and many even accept credit cards, making it unnecessary for drivers to carry large amounts of change. The use of credit cards has another advantage – the machines do not have to be emptied of coins as often, and the costs of counting coin and possible pilfering by employees who empty the parking meters also reduces their overall costs.