What indicates that a school bus is about to stop?

Flashing amber lights are used by school buses to warn drivers that the bus is preparing to stop to pick up or drop off children. When these lights are activated, it serves as a caution signal, indicating that drivers should slow down and be prepared to stop, as children may soon be entering or exiting the bus. This warning period is crucial, as it gives other motorists time to react appropriately and ensures the safety of the children.

In contrast, flashing red lights indicate that the bus is already stopped and that the extended stop sign is in place, signaling drivers to come to a complete stop. A loud horn does not serve as a standard signal for the bus stopping and is not specifically designed for this purpose. Flashing amber lights are an important safety feature that helps manage traffic around school buses effectively.