What is the primary function of the bus's stop arms and overhead red warning lights?

The primary function of the bus's stop arms and overhead red warning lights is to indicate that the bus is stopped and is either loading or unloading passengers, particularly children. When these signals are activated, it alerts other drivers that they must come to a complete stop and exercise caution in the vicinity of the bus. This is a critical safety measure designed to protect the vulnerable population of schoolchildren, who may be present near the bus as they enter or exit.

The use of stop arms and red lights is standardized and legally mandated in many places to ensure consistent recognition by drivers. This consideration helps reduce the potential for accidents, making it clear that stopping is necessary when these signals are in operation. Drivers must be trained to recognize these signals and understand their significance for maintaining safe school transportation practices.