Signs of the Times ?

Here are some of my images which are beginning to form a small side photographic project for me, loosely based around a common theme of  "Signs in Public".

I'm looking for a common thread here in these photos. I can't see very much humour in them, at least in all, and not all contain spelling mistakes.

Some are informational messages, some are hand written, and not all are in the same language. A common thread could be a textured background ? 

Couldn't decide between these last two, so I'm including them both in here for now. This is one of these photographic projects which I can pick up and put down with ease and which will develop in its own way over time.