What signage indicates that a driver must halt and check for safety?

Answer: C — stop sign

A stop sign is a traffic control device that instructs drivers to come to a complete stop at an intersection or designated point. This sign is crucial for ensuring safety, as it requires drivers to assess the surrounding area for other vehicles, pedestrians, or any potential hazards before proceeding. By mandating a halt, the stop sign plays a fundamental role in preventing accidents and ensuring that intersections are navigated safely. While yield signs also serve to regulate traffic and require drivers to give way to oncoming traffic, they do not necessitate a full stop. Speed limit signs indicate the maximum permissible speed, but do not require drivers to halt. Warning signs provide information about potential hazards but do not dictate a stop. Therefore, the stop sign is distinctive in its requirement for drivers to halt completely and ensure that it is safe to continue.