A speed sign is classified as which type of sign?

A speed sign is classified as a regulatory sign because it provides specific instructions that must be followed by road users. Regulatory signs are designed to inform drivers of the rules they must obey to ensure safety and smooth traffic flow. Speed limits dictate the maximum (or sometimes minimum) speed at which vehicles are permitted to travel in a given area, thereby playing a crucial role in regulating traffic behavior.

In contrast, warning signs are used to alert drivers to potential hazards or changes in road conditions, guide signs provide navigational information, while informational signs offer assistance and additional details related to the roadway or services available near it. Thus, the primary function of a speed sign is to regulate speeds, making it a regulatory sign.