Why is it important to have working headlights and taillights?

Having working headlights and taillights is crucial for visibility and safety, especially during nighttime driving or adverse weather conditions like rain, fog, or snow. Headlights illuminate the road ahead, allowing drivers to see obstacles and navigate effectively, while taillights notify vehicles behind you of your presence and intentions, such as braking or turning. This increased visibility is essential for preventing accidents and ensuring the safety of both the driver and other road users.

The other options, while they may seem relevant in some contexts, do not address the primary purpose of headlights and taillights. Improving fuel efficiency is more related to engine performance and aerodynamics rather than lighting systems. Enhancing a vehicle's exterior appearance is subjective and not the primary function of headlights and taillights. Reducing wear on wiper blades is unrelated to lighting; it pertains more to the maintenance of the vehicle's cleanliness and functionality. Thus, the safety aspect is unequivocally the most critical role of functioning headlights and taillights.