You should use your low beam headlight: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question You should use your low beam headlight: Answers When riding in fog. When following another vehicle. When approaching an oncoming vehicle. All of the above. Explanation Use your high beam whenever you are not following or meeting a car, even during the day. Use your low beam when riding in fog.