When driving on a highway at night, under what condition should you avoid using high-beam headlights?

Using high-beam headlights is essential for improving visibility in dark conditions, but there are specific circumstances where their use can be counterproductive. When following another car at night, it is advisable to avoid high-beam headlights because the bright light can blind the driver in front of you, impairing their vision and posing a safety risk. It is courteous and safer to use low-beam headlights in this situation to ensure that the driver ahead can see the road clearly without being distracted or blinded by your lights.

In contrast, situations like slowing down for a turn, traveling on a road without a median, or going downhill do not necessarily require the use of low-beams. While those scenarios may require caution or adjusted driving speeds, the primary concern with high-beam headlights is the potential impact on other drivers. This highlights the importance of being aware of how your vehicle's lighting can affect the visibility and reaction of others on the road.