What do yellow signs indicate on the road?

Answer: B — Hazard ahead

Yellow signs are primarily used to indicate potential hazards or changes in road conditions ahead. They serve as a warning to drivers to exercise caution and be prepared for various situations, such as curves, intersections, pedestrian crossings, or road work. The color yellow is universally recognized in traffic signage as alerting drivers to take extra care. Other signs in this context serve different purposes. For instance, traffic rules are typically indicated by regulatory signs that are usually red or white. Speed limits are specifically stated through rectangular white signs with black numbers. Parking restrictions are communicated through signs that also do not utilize the yellow color code, instead relying on different color schemes to indicate parking guidelines. Therefore, understanding the function and color coding of road signs is critical for safe driving practices.