What does the sign instruct drivers and passengers to do?

The correct answer indicates that the sign instructs drivers and passengers to always wear their safety belts. This is crucial for ensuring safety while traveling in a vehicle, as seat belts significantly reduce the risk of injury during accidents. They are a primary safety feature designed to protect both drivers and passengers by keeping them securely in their seats and preventing ejection from the vehicle in the event of a collision.

Adhering to this instruction aligns with traffic laws that mandate seat belt use, illustrating the importance of responsible driving practices. Other options, while related to traffic safety, do not focus on the specific instruction conveyed by the sign regarding the consistent use of seat belts.