American vs. European Parking Enforcement Objects: Chalk Stick vs. Parking Disc

Hey Europeans! Check this American thing out. This is a chalk stick. In U.S. cities, when you park in a limited-time slot—let's say it's a two-hour limit--parking enforcement officers use the stick to mark your tires with chalk. Then they come back in two hours, and any car they see that has chalk on the tires gets a ticket. They've been doing this at least since the 1940s. Hey Americans! Check this European thing out. This is a parking disc. (I mean it's not shaped like a disc, but...