What should a bus driver do if a stop sign is extended from the bus?

When a bus driver has an extended stop sign, it is an indication that they are allowing passengers to board or disembark. This is a crucial safety measure designed to protect students and other individuals as they enter or exit the bus. The extended stop sign signals to other road users that they must halt, ensuring that the area around the bus is clear and safe for movement.

In this scenario, option B is correct because the extended stop sign is used, and by allowing passengers to board and disembark, the driver is fulfilling their duty to ensure safety. The presence of the stop sign effectively communicates that all traffic must stop, providing a safe environment for passengers.

The other responses would compromise student safety or contradict the rules regarding school bus operation. Continuing to drive as normal would endanger passengers and violate laws governing school bus safety. Allowing traffic to move without stopping is also unsafe, as it would create a hazardous situation for those getting on or off the bus. Finally, only permitting cars behind the bus to pass does not adhere to the standard stop requirements that apply to all vehicles when the stop sign is extended.