What must drivers do when they see a school bus with its lights flashing?

Answer: B — Stop and wait until the lights stop flashing

When drivers see a school bus with its lights flashing, it is essential to stop and wait until the lights stop flashing. This law is in place to protect children who may be getting on or off the bus. The flashing lights indicate that the bus is either boarding or discharging students, and stopping ensures that these children can cross the street safely without the risk of being hit by an oncoming vehicle. By stopping, drivers allow for a safe environment where children can make their way to or from the bus and the school or their homes. This rule applies to vehicles traveling in both directions on undivided roads, ensuring comprehensive safety for all students. In contrast, passing the bus quickly poses a significant danger to the children and violates traffic laws designed to keep them safe. Honking the horn is unnecessary and could potentially distract or startle the children rather than provide any help. Continuing to drive unless children are present ignores the intent behind the law, which is to protect children at all times when the bus operates its warning lights. Thus, stopping and waiting for the lights to turn off is the only safe and responsible choice in this scenario.