Tennessee Permit Practice Test

When should you use low beam headlights?

1. In clear weather conditions

2. During the daytime

3. In fog, rain, or snow

4. When driving in the city

The correct answer is: In fog, rain, or snow

Using low beam headlights in fog, rain, or snow is crucial because these weather conditions can significantly impair visibility. Low beams produce a directed light that is less likely to reflect off precipitation and create glare, making it easier for drivers to see the road ahead. This is particularly important in fog or heavy rain, where high beams can cause the light to bounce back towards the driver, actually reducing visibility instead of improving it. In clear weather conditions, daytime driving, or when in a well-lit urban environment, low beams are generally not required since visibility is usually adequate. It's important to adjust headlight use based on driving conditions to ensure safety for yourself and others on the road.