In which of the following situations should drivers use their high beams?

Using high beams is most appropriate in situations where visibility is significantly compromised due to a lack of ambient light. On dark country roads with no oncoming traffic, high beams provide the best illumination, allowing drivers to see further ahead and spot potential hazards, such as animals or obstacles on the road. This is particularly important in rural settings where streetlights are scarce, and the road may be winding or narrow.

In urban areas with frequent streetlights, the additional brightness from high beams can create glare and is unnecessary, as streetlights already illuminate the road effectively. Similarly, using high beams in heavy fog or rainfall is not recommended because the intense light can reflect off the fog or rain, making visibility worse. Finally, when driving at night in the city, streetlights generally provide sufficient lighting, and high beams can also create glare for other drivers and pedestrians, which can be dangerous.