What does a yellow diamond-shaped sign indicate?

Answer: C — Warning of potential hazards ahead

A yellow diamond-shaped sign is specifically designed to warn drivers about potential hazards ahead. This shape and color combination is standardized in traffic signage to alert road users to situations that may require heightened attention or caution. Such warnings can include various conditions, such as curves in the road, changes in road conditions, pedestrian crossings, or other hazards that could affect safety. Other options, while relevant to road signs, do not apply in this case. For instance, construction areas are typically marked with orange signs, which signal that work is ongoing and pathways may be altered. Speed limit signs are usually rectangular and convey regulatory limits, whereas traffic signal signs, indicating an upcoming stoplight, also have a different shape and meaning, guiding drivers to prepare for potential signals. Thus, the correct interpretation of yellow diamond signs focuses on their role in warning drivers about potential dangers on the roadway.