What class of traffic sign is represented by yellow signs?

Answer: A — Warning

Yellow signs are classified as warning signs. These signs are designed to alert drivers and pedestrians to potential hazards or changes in road conditions ahead. For instance, you may encounter yellow signs indicating curves, pedestrian crossings, or construction zones, all of which require increased caution and awareness from drivers. This color choice is intentional, as yellow is highly visible and evokes alertness, which is essential for conveying important safety information on the road. The other categories—informational, regulatory, and guide—serve different purposes, such as providing direction, enforcing laws, or offering general information, but they do not represent the urgency and caution signified by yellow signs.