What color lights indicate that a school bus is about to stop to let children off?

Answer: B — Yellow flashing lights

The correct answer is yellow flashing lights. Yellow flashing lights on a school bus serve as a warning signal that the bus is preparing to stop and that children may be getting on or off. This feature alerts other drivers to slow down and prepare to stop, ensuring the safety of children. The use of yellow lights is specifically designed to give motorists notice that they should be vigilant and cautious as the bus is approaching a stop. In contrast, red flashing lights indicate that the bus is fully stopped, and children are either boarding or exiting. Blue and green lights are not used in this context for school buses and do not play a role in signaling the stopping protocol for student safety. Understanding this signaling system is crucial for drivers to help maintain the safety of children during these critical times.