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Great idea. The car already has sign-recognition technology so this should be easy to implement.

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

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

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

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

It seems it isn't just auto drive. Cars with object collision detection are slamming on the brakes when they come near this cattle grid. Signs wouldn't help in that case.