What is the standard color scheme for regulatory signs?

• A. Red and white
• B. Yellow and black
• C. Blue and white
• D. Green and white

Answer: (A)

Regulatory signs communicate traffic laws and required actions, so they need to grab your attention quickly and be easy to read at a glance. The color red signals prohibition or a must-do action, making it the most effective choice for command-and-prohibition signs, while white provides a high-contrast background for clear lettering and symbols. That combination—red with white text or imagery—is what you’ll see on many regulatory signs, like stop, do not enter, and other mandatory or prohibitive instructions. Other color schemes are used for different purposes: yellow and black for warnings, blue and white for services or information, and green and white for directional guidance. While there are some regulatory signs with different formats, red and white is the standard for conveying regulatory messages.