1.) Signs do not require a person to read. For example, the sign above clearly illustrates that I oughtn’t throw an entire container of dental floss into a toilet.
2.) Knowing the local language is irrelevant with a helpful illustrated sign.
3.) Signs can provide a conversation starter.
4.) Signs provide useful information. This is especially great when knowledgable people are either not present or grumpy.
5.) Whether text, illustrated, or both, signs provide something to look at when an additional task or distraction is appreciated. I particularly like texty signs as I can use them as starting points for word games.