Which sign indicates a school zone?

The yellow/green pentagon sign is specifically designed to indicate a school zone. This distinctive shape and color combination is used to alert drivers that they are approaching an area where children are likely to be present, especially during school start and end times. The pentagon shape is a recognized symbol for school areas and helps to enhance safety by making drivers more aware of the need to slow down and exercise caution.

In contrast, other sign types serve different functions. A red stop sign is used to indicate that drivers must come to a complete stop at an intersection. A yellow caution sign typically warns of potential hazards on the road but does not specifically denote school zones. Finally, a white regulatory sign conveys laws and regulations that must be followed, such as speed limits, but it is not specifically used to indicate a school zone. This is why the yellow/green pentagon sign is the appropriate choice for identifying school zones.