In which situation should you use your high beam lights?

Answer: C — On dark, unlit roads.

Using high beam lights is particularly effective on dark, unlit roads. High beams provide greater illumination, which enhances your ability to see potential hazards, road signs, and pedestrians that might not be visible with standard low beams. This increased visibility is crucial for safe driving in areas lacking sufficient street lighting. In contrast, using high beams in well-lit urban areas can cause glare for other drivers and is unnecessary due to the ample lighting provided by street lamps. Similarly, in city driving at night, where there are many lights and signs, low beams are sufficient and more considerate to other road users. Moreover, when cars are approaching from the opposite direction, it is important to switch to low beams to prevent blinding the oncoming drivers.