What does the color yellow typically indicate on a road sign?

The color yellow on a road sign is universally recognized as an indicator of caution or warning. It serves to alert drivers to potential hazards or changes in road conditions ahead. For example, yellow signs can indicate a curve, a pedestrian crossing, or a school zone, prompting drivers to decrease speed and stay vigilant. This color is effective in catching attention and creating a sense of alertness, which is crucial for ensuring safety on the roads. The underlying principle is that yellow conveys a need to be aware of possible dangers, allowing drivers to prepare for and respond to various road situations appropriately.