Halfway through writing a response I've realized that Americans have a completely different approach to icons compared to the rest of the world. In the US most traffic signs have text information on them, while in most other countries most signs are icon-only. Text is usually reserved for exceptional situations that cannot easily be represented with an icon. So we're going to be talking past each other because you'll insist that a "yield" sign absolutely needs the "yield" word, while I'll insist that it should not.