What must occur before a school bus can be put into motion?

Before a school bus can be put into motion, several safety protocols must be followed to ensure the safety of its passengers and others on the road.

One critical requirement is that all passengers must be seated. This is important because seated passengers are less likely to be injured in the event of sudden stops or accidents. Moreover, it helps maintain order and reduces distractions for the bus driver.

Closing the doors is another essential step. Open doors can pose a serious safety hazard, as they can lead to passengers being at risk of falling out or being in danger from passing vehicles. Ensuring the doors are closed provides a secure environment for the students during transit.

Additionally, having the headlamps lighted improves visibility, making the bus more conspicuous to other road users, especially in low-light conditions. This is crucial for enhancing safety as the bus navigates traffic.

Thus, all of these actions are interconnected and collectively contribute to a safe bus operation. Therefore, the requirement is that all these conditions must be met before a school bus can safely be put into motion, which is why the correct answer encompasses all of these steps together.