What is a potential disadvantage of setting your rear-view mirror to its night setting?

Setting your rear-view mirror to its night setting is designed to reduce glare from headlights of vehicles behind you, making nighttime driving more comfortable. However, one potential disadvantage is that it can hamper your ability to judge the distance of traffic behind you. This is because the night setting usually dims the reflection of headlights but can also alter depth perception. As a result, you may find it harder to accurately assess how far away vehicles are approaching from behind, which can affect your decision-making when changing lanes or merging.

The other options focus on different aspects of driving but do not directly relate to the specific impact of using the rear-view mirror’s night setting. For example, increasing glare from headlights is the opposite effect of what the night setting is intended to do. The visibility of the road ahead is primarily related to your windshield and headlight conditions rather than the rear-view mirror setting, and distractions related to pedestrians are more influenced by situational awareness and peripheral vision rather than mirror adjustments.