What type of signs usually warn drivers about a potential hazard ahead, such as curves or narrow bridges?

Warning signs are specifically designed to alert drivers to potential hazards or changes in driving conditions ahead. These signs are typically yellow or orange in color and often feature symbols or images that convey important information about the upcoming road conditions, such as curves, steep hills, pedestrian crossings, or narrow bridges. Their primary purpose is to prepare drivers to adjust their speed or position on the roadway to navigate safely through challenging areas.

In contrast, regulatory signs inform drivers of laws and regulations that must be followed, while information signs provide general guidance about locations, services, or points of interest. Guide signs assist in navigation, directing drivers to destinations, but they do not indicate potential hazards. Thus, the classification of warning signs makes them the most appropriate choice for alerting drivers to possible hazards they may encounter ahead.