Out in the way-out-back deserts of the American south-west there are some funny road signs. This set is one of my favorites:
First sign: Danger-Dust Storms
Second sign: Zero Visibility is Possible
Third sign: Do Not Stop on Roadway
Fourth sign: Use Extreme Caution
There is a disconnect here between the instructions and reality. Since there is no shoulder on this stretch of road to speak of, if visibility falls to zero and you wish to follow the instructions on the signs you must either throw the car over into the ditch or drive blindly forward.
I wonder what they really want you to do.
My favorite sign of all is, out in the very middle of nowhere at all:
Correctional Institution: Do Not Stop for Hitchhikers