When passengers are boarding and exiting the vehicle, school bus warning lights must flash...?

• A. Prior to entering the vehicle
• B. Continuously
• C. Prior to exiting the vehicle
• D. Only when promoted to do so

Answer: (B)

Warning lights are used to signal that the bus is actively stopped for loading or unloading. They must flash continuously during the entire time passengers are boarding or exiting, so approaching drivers consistently see the bus and slow down. This continuous flashing begins once the bus stops and doors open and continues until all pupils are on or off and the bus is ready to move again. Flashing only before entering, only before exiting, or only sometimes would not provide a steady warning throughout the whole stop.