I've driven by a house in my area that has a nice wood sign out front, over their garage, facing the street:
“We don't dial 911”
Since I tend to notice such things, I also noted the cameras mounted, to record any illegal acts of vandalism to their totally legal sign.
Consider the huge potential for any business offering inexpensive, discreet, vehicle mounted cameras to record attempted thefts and/or vandalism of POVs!