What type of signs are white rectangular in shape?

White rectangular signs primarily convey regulatory information that drivers must follow, which is why they are associated with rules that must be obeyed. These signs often indicate laws or regulations that are critical for ensuring the safety and proper function of roadways. For example, speed limit signs, which are important for maintaining safe driving speeds, fall into this category, but they are a specific type of regulatory sign.

While speed limit signs are indeed white and rectangular, the broader category containing all kinds of regulatory signs is best encapsulated in the idea of rules that must be obeyed. Regulatory signs enforce traffic laws, so understanding these signs is essential for safe driving practices. Informational signs and warning signs do not share the same shape or purpose, as they aim to provide information and warn drivers of potential hazards, respectively.