In middle-class neighborhoods people often have 1-2 car garages but rather use them for storage. So cars are left on the streets to park overnight, often getting covered during holidays, or when their owners are out of town.
The series shows cars that have a presence. They command their space. They are mostly loners and shy away from being too close to others. Many sleep in covers, wearing them like nightgowns, though some sleep in the nude. Some take daytime naps, a few lucky ones sleep in pairs.