What color are warning signs most commonly?

Warning signs are commonly yellow because this color is universally associated with caution and alertness. The bright yellow hue is highly visible and draws attention, making it easy for drivers to recognize potential hazards ahead. This is crucial for maintaining safety on the road, as it prompts drivers to reduce speed or be cautious due to upcoming dangers like sharp turns, pedestrian crossings, or construction zones.

Other colors have specific meanings in traffic signage; for instance, green typically indicates guidance or direction, blue is used for informational signs, and red signals prohibitions or stops. Hence, yellow is specifically chosen for warning signs due to its effectiveness in conveying caution to drivers.