What should a driver do upon seeing a school crossing sign?

When a driver sees a school crossing sign, the appropriate action is to prepare to stop for crossing pedestrians. This sign indicates that children may be present and are likely to be crossing the street, either going to or from school. The intent of the sign is to alert drivers to reduce their speed and be vigilant, as the safety of school-aged children is paramount.

By preparing to stop, the driver contributes to a safer environment for children and demonstrates responsible driving behavior. School zones typically have speed limits reduced for this reason, and obeying these signs is crucial for the protection of vulnerable pedestrians. This consideration applies regardless of whether children are currently visible, as they may appear unexpectedly.

The other options suggest behaviors that could endanger anyone using the crossing, such as accelerating or ignoring the sign unless children are present, which contradicts the primary purpose of the school crossing sign to ensure safety at all times.