Final answer:
When a vehicle has a two-part safety belt system, you are required to use both parts, the lap belt and the shoulder harness, for proper protection. This is both a legal requirement and a measure to ensure personal and public safety.
Step-by-step explanation:
If your vehicle has a two-part safety belt system, you should use both parts of the safety belt system.
The two-part system is designed to provide maximum protection in the event of a collision. Using both parts, usually the lap belt and the shoulder harness, ensures that you are restrained properly, reducing the risk of injury or death during an accident.
It's not just about personal safety; it is a legal requirement in many places because not wearing a seat belt can have significant consequences on public health and emergency services.
Many governments enact laws requiring the use of seat belts to reduce the number of serious injuries from car accidents.
Society has an interest in protecting its members from harm and ensuring that individuals do not engage in behavior that could result in long-term care needs that society must fund. Therefore, it is important to wear seat belts as prescribed by law and for your own safety.