This document discusses public signage and how effectively signs communicate information to people from different backgrounds. It analyzes a warning sign in Dutch that indicates a ferry landing is slippery when wet or frozen. While tourists from various countries could not understand the text, contextual clues and voices provided the meaning. The document argues public signs need quick interpretation without study in order to be effective for all audiences regardless of language or literacy. Examples from Macau and Hong Kong show how images and symbols can convey meaning even without text translation, though full understanding of individual rules may require language knowledge.