Final answer:
Rectangular black on white signs indicate regulatory information that road users must follow, such as speed limits and parking regulations. These differ from warning, scenic route, and construction zone signs, which have different purposes and typically display different colors.
Step-by-step explanation:
Rectangular (4-Sided) Signs that are black on white typically indicate regulatory information. This type of signage is designed to inform road users about traffic laws and regulations that must be followed. Examples of regulatory signs include speed limit signs, no parking zones, and stop signs. While regulatory signs are essential for maintaining road safety, it is crucial to recognize and understand other sign types as well. Warning signs, for example, usually have a yellow background and are meant to alert drivers of potential hazards ahead, such as a sharp turn or a school zone. Scenic route signs often have distinctive brown backgrounds and symbolize information about tourist attractions and points of interest. Lastly, construction zone signs are typically orange and are used to alert drivers about road work ahead, indicating that caution should be exercised when navigating through or around the work zone.