Regulatory signs are typically identified by which color combination?

• A. Green, white, and blue
• B. Yellow and black
• C. Black, white, and red
• D. Red and blue

Answer: (C)

Regulatory signs convey rules you must follow, so they use high-contrast colors that grab attention quickly. White backgrounds with black lettering clearly state the rule, while red is reserved for commands or prohibitions (like Stop, Do Not Enter, or No Parking). This mix—black, white, and red—appears on many regulatory signs, making them instantly recognizable and legible from a distance.

Other color schemes belong to different sign families: green, white, and blue are common for guide or information signs; yellow and black warn of hazards; red and blue isn’t the standard look for regulatory panels.