lots

http://www.wired.com/autopia/2012/02/quickpay-turns-your-smartphone-into-a-parking-attendant/

The biggest hassle in using the town lots, besides finding a space, is paying. With few pay stations there's almost always a line.  This would be a lot quicker and easier, and even if it attracted only 25% of parkers that would lessen the line to pay.