When can a school bus driver proceed across a multi-lane highway?

The chosen answer is correct because a school bus driver must ensure that there are no approaching vehicles that pose a hazard before proceeding across a multi-lane highway. This consideration prioritizes the safety of the children and other road users. Safety is paramount, and evaluating the presence of potential dangers is essential in decision-making for school bus operation.

It is vital for drivers to remain vigilant about their surroundings and make sure that the road is clear of any oncoming traffic that could create a dangerous situation. This ensures that the driver can cross safely, particularly given the added responsibility of transporting children.

The other options involve scenarios that do not adequately assess safety. Being the first vehicle in line does not guarantee safety if there are approaching vehicles, a green light does not always ensure that the intersection is clear of traffic, and being signaled by a traffic officer may not apply in every situation. Therefore, evaluating the presence of hazards is the critical factor that determines when a school bus driver can safely proceed across a multi-lane highway.