Important Signs

I didn't have to campaign too hard to get some help creating a sign to prevent this antisocial habit. I haven't as yet seen it on any public transport, but I live in hope.


I have however, seen another sign which took me by surprise. I found this in Germany, and had to wonder whether this is a huge annoyance on the continent. So much so that something had to be done about it. I wonder if this rule is enforced?