Final answer:
The headlights on a car should not be used or should be dimmed in certain situations to avoid blinding other drivers and to conserve battery power.
Step-by-step explanation:
The headlights on a car should not be used or should be dimmed in certain situations to avoid blinding other drivers and to conserve battery power. For example, when driving in a well-lit city or when there is enough daylight, it is not necessary to use headlights. Additionally, when approaching a car from behind or when driving on a narrow road with oncoming traffic, it is polite to dim your headlights to prevent glare and ensure safe visibility for other drivers. Finally, it is important to dim or turn off the headlights when parked, especially overnight, to avoid draining the car's battery.