[TRcontrarian]

Someone might find it hilarious to put that sign in their front yard to mess with passers by

[hypertele-Xii]

Pretty sure it's illegal to put up traffic signs without permission.

[wasdfff]

Illegal but unenforced unless its called in. There are a number of these in my neighborhood in effort to stymie tourists.

[btbuildem]

I imagine it would be more than a visual sign -- something with a specific emitter, etc, not easily spoofed.