"Signs, signs, everywhere a sign...."
I think that one would be a little more effective if it had a bunch of well-grouped bullet holes through it from the home owners' side. With a target on the other side, I guess. It's an idea I've had for several years for the part of my driveway where a person coming up the hill just barely comes into view from my shop door.
But I wouldn't have a sign, just the bullet riddled target.