What does a stop sign require a driver to do?

A stop sign indicates that a driver must come to a complete stop at the marked stop line, if one is present, or at a point where they can ensure there is no oncoming traffic or pedestrians entering the intersection. This means the driver should stop before the crosswalk, allowing pedestrians to cross safely, and ensure it's clear to proceed before continuing.

This option is the most comprehensive because it emphasizes safety and compliance with traffic laws, ensuring that the driver is aware of their surroundings, particularly the presence of pedestrians. The requirement is clear: to ensure full visibility and safety for all road users. Stopping at the marked line or far enough back allows drivers to assess traffic conditions effectively before proceeding.

In contrast, other options are insufficient in their instructions; stopping only if no other vehicles are present does not account for the possibility of pedestrians or other road users needing to access the intersection safely. Stopping at the curb is vague, as it may not necessarily coincide with the safest stopping point. The focus of the stop sign is on ensuring that all necessary checks and precautions are taken before continuing through an intersection.