Final answer:
An adult passenger over the age of 18 is typically responsible for wearing their seat belt properly in an automobile according to legislation aimed at protecting individuals and society.
Step-by-step explanation:
In the context of automobile safety and legal responsibilities, an adult passenger over the age of 18 would generally be responsible for their own safety, which includes wearing a seat belt properly. Legislation is in place to safeguard individuals and society from the consequences of negligent behavior, such as not wearing seat belts. Such laws are there to prevent accidents resulting in severe injury, which can become a burden to the individual and society due to the potential need for long-term medical and physical care. There might be differences in specific laws depending on jurisdiction, but typically adults are legally required to ensure they use the seat belt.