The correct answer is: 20 kilometers per hour
In New Zealand, when drivers approach a school bus that is picking up or dropping off children, they must not exceed a speed of 20 kilometers per hour. This regulation is important for the safety of children traveling to and from school. Children may cross the road near the school bus and may not always be aware of the risks posed by oncoming vehicles. By limiting the speed of vehicles passing the school bus, it allows drivers more time to react and helps prevent potential accidents.