Alternate-side parking is a parking rule where you can only park on one side of the street at certain times or days, and must move your car to the other side on alternate days. Allows snow plows, garbage trucks, and street sweepers to do their jobs.
Alternate-side parking sign, no parking at days 16 to 31. (Saint-Just, France) © Wikimedia.org/KiwiNeko14, CC BY-SA