What signal is used by a school bus driver to alert other drivers of loading or unloading?

The correct signal used by a school bus driver to alert other drivers of loading or unloading is the flashing red lights. This signal is essential for ensuring the safety of children as they enter or exit the bus. When these red lights are activated, it indicates that the bus is stopped and that the children are either boarding or disembarking.

The significance of this signal lies in its visibility and clear communication to other drivers, who are required by law to stop when they see a school bus with its red lights flashing. This is a critical safety measure designed to protect children, as they are often in close proximity to the road during these times.

Other signals, such as flashing yellow lights, serve to warn drivers that the bus is preparing to stop, but they do not require drivers to stop until the red lights are activated. Hand signals provide additional communication but are not the primary method used for alerting traffic in this context. Standard traffic signals regulate traffic flow but do not specifically apply to the loading and unloading of passengers on a school bus.