Pink Tentacle has collected a number of quite amuzing vintage posters from the Tokyo subway, which were used to promote good manners and the right way of using the transport system. The posters liberally use icons and characters from popular culture in a context that is quite surprising.
In these posters from 1976, Superman warns you against throwing your chewing gum on the floor, and tells you to always show your subway pass to all personnel. Even though these are clearly official posters, issued by a government body, the absence of any copyright information is quite remarkable. Also, dig the design of the Superman symbol !