Do you currently have car insurance? Insurance is mandatory to drive in California Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question Headlights are required when visibility is less than: Answers 100 feet. 300 feet. 500 feet. Explanation Iowa law requires drivers to use their headlights from sunset to sunrise. Headlights must also be used at any other time when visibility is limited to 500 feet or less. Take a FREE Practice Test Now This questions appears in the following tests: Iowa Practice Test