One of the difficulties travelling in Spain, on the Camino, is interpreting the signs. There is always the ubiquitous yellow arrows and shells that assure you, you are on the right path, unless of course, you’re not and you don’t see any.
This one was tougher. I’m guessing the cars either make popcorn or fart. Either way, it would be so extraordinary as to not need a sign.
This one is the same in any language. “Happy Hydrant”.
I personally found this very confusing.