La has a moratorium on digital and supergraphic signs, which means any signage that goes up that wasn't there yesterday is illegal. This makes it very easy for residents to help spot these eyesores and report them to the city. The fact that no authority needs to determine the new signs illegality allows the city attorney's office to act immediately. In fact, the city attorney's office has setup a website where residents can report illegal signs directly to them, and skip over any red tape, or other offices which might slow down the process of serving these law breakers.
Despite there being no similar moratorium in New York, a web form which allowed residents to report illegal signage would be very helpful here as well. Often when I call in violations to the DOB through 311, my description of the billboard is recorded incorrectly and or I have an image I would like to include. In an effort to alleviate the burden the Sign Enforcement Unit has, web forms with image attachments would allow the team to determine some billboards legality without leaving the office.