What does a yellow traffic sign usually indicate?

A yellow traffic sign is primarily used to provide general warnings to drivers about potential hazards or changes in road conditions ahead. This color is specifically chosen because it stands out and signals caution, alerting drivers to slow down and be attentive to what lies ahead. For example, a yellow sign might indicate a curve in the road, pedestrian crossings, or animal crossings.

In contrast, other options represent different types of information conveyed by various colors and shapes of traffic signs: stop and yield signs typically use red; services for travelers are indicated by blue, and directions are often shown in green or white. Understanding the function of yellow signs is essential for safe driving, as they keep drivers informed about possible dangers and changes in the driving environment.