What shape is used for a traffic regulation or direction sign?

Traffic regulation or direction signs are generally rectangular in shape. This design is widely recognized for providing essential information to drivers about road rules and upcoming hazards. Rectangular signs can convey a variety of important messages, including speed limits, parking regulations, and other critical directives that enforce traffic laws and ensure safe driving practices.

The rectangular shape is effective for allowing clear visibility and understanding. For instance, horizontal rectangles are often used for regulatory signs, while vertical rectangles can indicate guidance or information.

Other shapes serve different purposes; for example, diamond-shaped signs indicate caution or warning about upcoming risks, pennant shapes are specifically used for no-passing zones, and circular signs typically indicate railroad crossings or other critical alerts. Recognizing these shapes helps drivers quickly identify the nature of the information being presented.