I do almost all my laundry at truck stops. Most of the larger chain truck stops have laundry rooms and many of the smaller, independent truck stops do, too. Travel Centers of America or TA™ have laundry rooms equiped with credit card readers. Very convenient. This particular system has one card reader that is connected magically* to all the washers and dryers in the room. Swipe your card and select the washer (or dryer) you want to use. The price is the same whether you use coins or credit.
*Sufficiently advanced technology.