What does the color yellow indicate for road signs?

The color yellow on road signs primarily indicates warning signs. These signs alert drivers to potential hazards or changes in road conditions ahead, prompting caution. Common examples include signs for curves, steep grades, and pedestrian crossings. The use of yellow is effective because it is bright and easily noticeable, drawing attention to important safety information that drivers need to be aware of during their travels.

Regulatory signs typically use colors like red or white to convey mandatory instructions or prohibitions. Construction zones often feature orange to signal that road work is underway, and parking information signs usually utilize blue or green to provide guidance relevant to parking regulations. Each of these colors serves a specific purpose in road signage, but yellow remains designated for warnings.