When must vehicles stop for a school bus with flashing lights?

Vehicles must stop for a school bus with flashing lights in both directions on a two-way street because the safety of children getting on and off the bus is paramount. School buses are equipped with flashing lights and an extended stop sign to alert drivers that they need to stop, regardless of the direction from which they are approaching. This law is in place to ensure that children have a safe environment to enter and exit the bus, as they may unexpectedly cross the street or approach the bus.

On a one-way street, drivers must also stop when the bus is picking up or dropping off children, but the question specifically highlights the rules that apply to two-way streets, where the risk is greater since vehicles in both directions must be aware and prepared to stop for children. The requirement for all vehicles in both directions to stop is critical because children may not always be visible, and traffic must come to a complete halt to significantly reduce the risk of accidents.

In summary, stopping in both directions on a two-way street is a crucial safety measure designed to protect children, making this answer the most accurate choice.