Pay Toilets
It used to be that the Germans were the only country in Europe not charging to use the loo, but I suppose they need to boost everyone else's economy so now they too charge to pee. At this rest stop you bought a ticket to use the potty and when you were done you could use the ticket's value to knock .70 Euro off any purchase in the shop. I like this much better than the old Gypsy ladies sitting in the men's room yelling at you when you didn't drop coins in their basket.