During my research on the internet I found something funny:
April 25th Rosenthaler Platz in Berlin was the point of a fascinating
guerilla street art event. It started with bikers that poured paint in
front of cars that waited for green lights. The cars was then forced to
get their cars and wheels turned into a giant paint brush.
According to Daniel K,
the activits behind this event, afterwards taped posters on the lights
reading “washable, organic, biodegradable” to ensure that the paint did
no real long term harm to the junction.
Great idea !