What is Carwalking?

Legal Definition
Carwalking is the unlawful act of walking above cars, normally illegally parked on pedestrian zones. Carwalking is understood by all criminal codes as damage of private property. Carwalkers normally do it, as a radical protest against the intensive motorization rates in cities whose one of the main consequences is illegal parking on sidewalks and areas exclusively allocated to pedestrians. One famous carwalker was Michael Hartmann who largely made it in Munich in the eighties.
-- Wikipedia