What color are permanent warning signs?

Permanent warning signs are designed to alert drivers to potential hazards or changes in the road conditions that require caution. The standard color for these signs is yellow with black lettering. This color combination is effective in capturing attention and conveying the need for alertness, as yellow is a bright, visible color that stands out against many backgrounds. The black lettering provides a strong contrast, ensuring that the message on the sign is easily readable even from a distance.

While other colors are used for different types of signs—such as blue for informational signs and red for prohibitive signs—yellow with black lettering specifically serves the purpose of warning drivers to be vigilant and prepared to respond to any potential dangers ahead. Thus, this color coding is essential for ensuring road safety and effective communication of important information to drivers.