According to Japanese Traffic Law, which personnel are required to wear seat belts in a vehicle?

In Japan, traffic laws mandate that all personnel inside a vehicle must wear seat belts, making the correct answer the choice that states all personnel inside the vehicle are required to wear them. This law is designed to enhance safety and reduce injuries during accidents, reflecting a comprehensive approach to vehicular safety.

Requiring everyone in the vehicle to buckle up underscores the importance of collective responsibility for safety, as it is not just the driver who is at risk, but also passengers. This rule helps ensure that everyone, regardless of their age, position in the vehicle, or relation to the driver, is protected. It highlights Japan's commitment to reducing traffic-related injuries and fatalities, aligning with practices seen in many countries with strict traffic laws.

The other options imply either limited responsibility—only the driver or only passengers over a certain age—which does not align with Japanese law that prioritizes universal seat belt use for all occupants.