In addition to signs on doors, consumers must also observe road signs. The two signs that give the most problems are both arrows. When the same sign is used for two different purposes, it creates confusion in the driver's mind and, potentially, it can cause an accident. Road Crews have a tendency to place these arrows too far ahead of the proposed turn, often placing them such that drivers might drive in the turning lane past several possible turns. This causes drivers to be where they are not expected and where, technically, they ought not to be.
All signs say something.
They give directions, and they give clues as to the general competence of the providers responsible for those signs.