Interesting debate...and I sort of see both sides, but I'm not a landowner so there is a lot I don't understand on this issue. But, one thing that crossed my mind in regards to having to have signs posted is, what about language barriers? If you're against doing it, you could tell your lawmakers signs are ridiculous because you need to post them in at least four or five languages to cover everyone and that's asking way too much
Or wait, I just thought of something! (duh) Are the signs just symbols? (yes, I'm ignorant on this one! sorry, but trying to learn)