What does it mean if a school zone sign is flashing?

A flashing school zone sign serves as a crucial alert to drivers that they are approaching a designated area where children may be present, particularly during times when students are arriving at or departing from school. This indicator signals drivers to reduce their speed and remain vigilant for children crossing the road or walking nearby. School zones typically have lower speed limits to ensure the safety of young pedestrians, and the flashing lights emphasize the importance of the increased caution required in those areas.

The other options suggest different scenarios that do not align with the intent of the flashing sign. For instance, indicating that no stopping is allowed contradicts the need for flexibility in response to children's movements. Similarly, stating that it’s safe to drive at normal speed overlooks the necessity for reduced speed in such contexts. Finally, the assertion that all traffic should stop immediately is not practical; drivers should proceed with caution rather than come to a complete stop unless required for safety.