What color are warning signs?

• A. Yellow or fluorescent yellow-green.
• B. Blue.
• C. Red.
• D. Orange.

Answer: (A)

Signs use color to communicate quickly. Warning signs are meant to alert you to hazards ahead, and their standard color is yellow to grab attention. Fluorescent yellow-green is used too for even higher visibility in certain areas, like construction zones. Other colors have different meanings: blue signals services or information, red indicates stop or prohibitions, and orange is tied to construction warnings. So the color you’ll most commonly associate with warning signs is yellow, or fluorescent yellow-green when extra visibility is needed.