I have seen this kind of posters on the train some times.
But not until Dr. Armstrong introduced us the posters, I never cared about them because what the posters mean ia common sense.
I never put on making-up or lying on the sofa on the train, however I've seen some peoploe doing so. While I want nobody to do so, I cannot warn people who seem not to care manner.
So I think this kind of poster is needed to recognize us what manner is again.
On the other hands, I think it is not a good tendency that Japanese come to be less careful about manner. We should act neatly and try not to annoy others in public without any warnings. So we need to make sure how we should act in public again.
