What does it mean if a road sign is rectangle-shaped?

A rectangle-shaped road sign primarily indicates regulatory information. These signs convey essential rules that drivers must follow, which can include speed limits, parking regulations, and various laws governing road use. The rectangular shape is designated for these types of signs to ensure that drivers can recognize and understand important regulatory messages quickly and easily.

Other shapes, like diamonds, are commonly used for warning signs, and circular signs typically denote railroad crossings. Informational signs can also have various shapes, such as square or rectangular, but they usually serve a different purpose focused on providing directions or information rather than regulatory commands. Understanding these shapes helps drivers navigate the road effectively while adhering to local laws and safety standards.