Which color of signs primarily conveys regulatory information like speed limits?

White signs are primarily used to convey regulatory information, such as speed limits, parking regulations, and other rules that drivers must follow. These signs often feature black or red text and symbols to make them clear and easily readable. The regulatory nature of white signs ensures compliance with traffic laws and safe driving practices.

In contrast, green signs typically provide directional guidance and information about location, yellow signs are used to indicate caution or warning about potential hazards, and red signs denote prohibitions or important alerts but are not generally used for speed limits or other regulatory details. Thus, white is the correct choice for conveying regulatory information.