Final answer:
No, the driver should not start the vehicle in motion before every passenger is seated.
Step-by-step explanation:
No, as the driver of a school bus, you should not start the vehicle in motion before every passenger is seated. This is because it can be dangerous for both the passengers and the driver. When a person is standing up from a seated position while the bus is moving, they can lose their balance and fall, causing potential injuries. Similarly, if a car accelerates while driving and a passenger is not seated, they can be thrown off-balance and sustain injuries. Therefore, it is important to wait until all passengers are seated before starting the vehicle in motion.