Ways of expressing

When you ski in Germany, the signs tell you "VERBOTEN hier zu skilaufen. VERBOTEN". Very direct. Very very direct, intending to scare I think. Well, I get scared anyway. I wonder what it would be like to ski if England had any sorts of ski-slopes (apart from the plastic indoor ones in Milton Keynes)? "Would you please not venture down this way since there might be some inconveniences involved. Many thanks in advance".