Which color of traffic sign signifies caution?

The color yellow is universally recognized as the color of caution in traffic signs. This is because yellow is highly visible and stands out against various backgrounds, making it effective in drawing attention to situations that require drivers to be alert. Caution signs typically alert drivers to potential hazards, changes in road conditions, or other important information that could affect their safety, such as curves, pedestrian crossings, or construction zones.

In contrast, red often signifies stop or prohibition, green indicates permitted actions such as proceeding or directions, and blue is used for informational signs that provide services or amenities to travelers. Each color serves a distinct purpose in communicating essential information to drivers and helping ensure road safety.