Graffiti Steet Cleaner

This idea is to fund municipalities thereby keeping my taxes low. Street cleaners would be outfitted with an array of colored chalk dispensers on the rear so that after it cleans the roadway it "prints" advertizing on the road using 3 colors of chalk in the same way an inkjet printer does. A municiple website would allow advertizers to use a java applet to design their own road-graffiti which would be uploaded via wireless to the street cleaner when it is parked for the evening. Cons: a dashed yellow line veering left might be confusing to some drivers; A.I. would be needed to weed out confusing/pornographic designs. Doesn't work in the rain/snow.