Final answer:
Indiana law mandates that both drivers and all passengers must wear seat belts whenever the vehicle is in motion, to ensure safety.
Step-by-step explanation:
Indiana law requires the driver and all passengers to use seat belts whenever a vehicle is in motion. All vehicle occupants must be properly restrained at all times when the vehicle is on the road as a means of reducing the risk of injury or death in case of an accident.
It's important to understand that this legal requirement is designed to keep people safe on the roads and it is a mandatory compliance for all drivers and passengers.