Question When driving in fog, you should: Answers Use your horn. Use the low beam lights. Use the high beam lights. Use the heater. Explanation If you must drive in fog, you should use your low beam headlights and fog lights to maximize your visibility. Using high beam lights will only make it more difficult for you to see. Take a FREE Practice Test Now This questions appears in the following tests: Minnesota Knowledge Test Class A , South Carolina Knowledge Test Class A , Tennessee Knowledge Test Class B ,