He painted the road with new markings (stop) that didn't exist, and took down signs indicating there was a crosswalk and replaced them with stop signs. Obviously none of these should be some sort og huge crime but you could definitely be an ass about it and charge someone for all of these crimes for it. Doubt it'd hold up in court for any actual punishment.

Painting on the road = vandalism

Changing the signs for different ones = interfering with traffic control device

Taking down signs that are government property = grand theft