What vehicle must stop for a school bus loading or unloading children?

Answer: B — All vehicles must stop, except those on the opposite side of a divided highway

All vehicles must stop for a school bus that is loading or unloading children, with the exception of those on the opposite side of a divided highway. This rule is put in place to ensure the safety of children who are getting on or off the bus. When the bus has its stop sign extended and lights flashing, it indicates that children may be crossing the street, necessitating that all nearby traffic comes to a halt, regardless of the vehicle type or whether there are children on board. On highways that are divided by a physical barrier, vehicles traveling in the opposite direction are not required to stop, as the separation provides a significant safety margin. This regulation emphasizes the importance of vigilance among drivers when in proximity to school buses, as it helps prevent accidents and ensures that children can safely move to and from school.