What does a yellow diamond-shaped sign indicate?

Answer: B — Warning or caution

A yellow diamond-shaped sign is a standardized symbol used in traffic signage to indicate warning or caution. These signs alert drivers to potential hazards or changes in road conditions that require careful attention, such as sharp turns, pedestrian crossings, or roadwork ahead. The yellow color signifies warning and is intended to capture the driver’s attention, thus promoting safety. In contrast, speed limit signs typically use rectangular shapes and have specific numerical speed limits displayed in white on a black background. Informational signs, which provide details about locations or services, often take on rectangular shapes in various colors, but not in the yellow diamond format. Regulatory instruction signs, which dictate rules that must be followed, usually feature more standardized shapes with clear commands, often in red or white. Consequently, the design and color of yellow diamond-shaped signs are specifically meant for caution, making this response the correct interpretation of their meaning.