Rectangular traffic signs that tell you the rules of the road are typically which colors?

• A. Blue and white
• B. Green and Yellow
• C. Purple and Orange
• D. White, black, and red

Answer: (D)

When signs tell you what you must or must not do, they’re regulatory signs, and they’re designed for quick, clear recognition. Rectangular regulatory signs typically use a white field with black lettering so the rule is easy to read at a glance. Red is added for emphasis on prohibitions or mandatory actions, so you’ll often see red used on these signs as well. That combination—white, black, and red—covers the common appearance of rules-signs that govern actions like speed, lane use, or parking. Other color schemes are used for different purposes (blue and white for services, green and yellow for guidance or warnings), so they aren’t the standard look for signs that convey the road rules.