here (Vancouver Canada) we have similar security ads all over out transit system

https://imgur.com/bYVXi7x,DQticJw#0 https://imgur.com/bYVXi7x,DQticJw#1

We also have ones promoting considerate social behavior:

http://imgur.com/Rqv5hLr,Zh7k1Qf#0 http://imgur.com/Rqv5hLr,Zh7k1Qf#1