South Dakota Driving Practice Test

When driving in fog, the recommended lighting method is to use low beam headlights. This is because low beam headlights provide adequate illumination without causing excessive glare that can reflect off the fog, rain, or snow back into your eyes. High beam headlights, while useful in clear conditions, can actually make visibility worse in fog by reflecting off the moisture in the air and creating a blinding effect.

Turning off all lights is not a safe option because it can make your vehicle invisible to other drivers, increasing the risk of accidents. Using only fog lights is applicable in some conditions, but they are meant to work in conjunction with low beams or when visibility is extremely low. Therefore, using low beam headlights ensures you have the best visibility possible while remaining safe on the road in foggy conditions.