What does a yellow diamond-shaped sign indicate?

Answer: B — Alert for potential hazards or changes in road conditions

A yellow diamond-shaped sign is used to alert drivers to potential hazards or changes in road conditions. This shape and color combination is universally recognized as a warning, indicating that drivers should proceed with caution and be prepared for various scenarios that may affect their driving, such as sharp curves, intersections, or animal crossings. While yield signs, speed limit signs, and school zone signs have their own specific shapes and colors—such as the inverted triangle for yield and the rectangular shape for speed limits—yellow diamond signs are specifically designated for warning purposes. Thus, encountering a yellow diamond sign means that drivers need to be vigilant about the road conditions that lie ahead.