When driving in fog, you should: Before you start the test, please answer the question below regarding your insurance status. Without insurance you will not be able to drive in Your state Do you currently have CDL insurance? Yes I have insurance. Great, you're all set! Click here if you still want to compare rates. No, I need insurance and I want to compare options. Question When driving in fog, you should: Answers Use the windshield wipers. Use low beam headlights. Use high beam headlights. Use the air conditioning. Explanation If you must drive in fog, you should use your low beam headlights and fog lights, even during the daytime. This questions appears in the following tests: Colorado Class A Knowledge Test Colorado Class B Knowledge Test Colorado Class B Knowledge Test Florida Double Georgia Double Nebraska Class A Knowledge Test Nevada Class A Knowledge Test North Dakota Bus Wisconsin Class B Knowledge Test