Sitting on a train in the UK you might read:
Please turn off your mobile phone
Show consideration to others and keep your phone conversations to a minimum
Blah blah blah
I spotted this picture on a train from Grasse to Cagnes sur Mer earlier today. It told me everything I needed to know, and not a word in sight. I think more companies could be easier to understand if they relied less heavily on words, and instead used more visual cues.
Sometimes we try too hard to get our point across.