I’ve seen construction vehicles with a ‘Keep Back 500 Feet’ sign on them, meaning that loose dirt, rocks etc. can fly out of them. But why these signs?
I guess I understand the basic message, namely that these trucks are headed for unmaintained roads. But why the need to warn people of this, in this way (i.e. the “Do Not Follow” part)? Why would anyone be likely to follow one of these trucks more than another vehilce? Are they more intended for big cities like NYC where a closed road might not look so closed?