Which of the following indicates that a driver must stop?

A stop sign indicates that a driver must come to a complete stop at the intersection. It is a regulatory sign that clearly instructs drivers to halt their vehicle before proceeding. This is essential for maintaining safety on the roads, as it ensures that drivers have the opportunity to check for oncoming traffic, pedestrians, and any other potential hazards before continuing on their way.

In contrast, a yield sign instructs drivers to slow down and prepare to stop if necessary, but it does not require a complete stop unless there are vehicles or pedestrians in the way. A speed limit sign provides information regarding the maximum speed allowed, and a no parking sign indicates areas where parking is not permitted but does not require the vehicle to stop unless the driver intends to park. Therefore, the stop sign is the only sign that mandates a complete halt, emphasizing its role in traffic regulation and safety.