Final answer:
Seat belt usage has increased due to safety laws and campaigns, along with technological advancements like mandatory airbags, enhancing occupant protection during crashes.
Step-by-step explanation:
Since 1986, seat belt usage has increased significantly due to public safety campaigns and laws enacted by the government. These measures were taken to protect society by reducing the number of car accidents resulting in serious injuries that would require long-term medical care.
Moreover, advancements in safety technology, such as the development and mandatory implementation of airbags since 1991, have also contributed to better protection of vehicle occupants during crashes. The force exerted on occupants during a collision is substantially lowered by airbags, which complements the protection offered by seat belts.