http://drivinglaws.aaa.com/tag/headlight-use/ Headlight Use - AAA Digest of Motor Laws Turn on the headlights, Turn on the headlights, Headlight Use - AAA Digest of Motor Laws state law in some parts of the U.S. Some states have a windshield wiper law require the use of headlights http://drivinglaws.aaa.com/tag/headlight-use/ handy reference