What is a common characteristic of warning signs?

Answer: C — They alert drivers to potential dangers or conditions.

Warning signs are designed to alert drivers to potential dangers or hazardous conditions they might encounter on the road. These signs typically feature yellow backgrounds and are often accompanied by symbols or text that describes the specific warning, such as curves, hills, or pedestrian crossings. The primary purpose of these signs is to enhance safety by making drivers aware of situations that require caution, allowing them to adjust their speed or actions accordingly. In contrast, signs that are blue generally provide information about services, while speed limit signs convey regulatory speed changes. Regulatory signs illustrate rules that drivers must follow, such as stop or yield signs. Therefore, understanding that warning signs specifically focus on alerting drivers to hazards is crucial for safe driving practices.