NHSA Driving Knowledge Practice Test

Driving in fog presents unique challenges due to reduced visibility, which can be dangerous. The safest approach is to use low beam headlights and reduce speed. Low beam headlights are specifically designed to project a light that is less likely to reflect off the fog or mist in the air, thereby minimizing glare and allowing for better visibility.

By reducing speed, drivers have more time to react to sudden changes in their environment, such as other vehicles, pedestrians, or obstacles that may be obscured by the fog. This combination of low beams and slower speeds enhances safety because it improves visibility while allowing for better control.

Using high beam headlights can actually worsen visibility in fog because the light reflects off the fog droplets, creating a white wall effect that can obscure the road ahead. Driving with parking lights only or fog lights without adjusting speed may not provide adequate illumination for safe driving, particularly on roads where visibility is extremely low. Therefore, using low beam headlights and reducing speed is the most effective way to navigate through fog safely.