http://www.dmv.org/ca-california/safety-laws.php DMV website http://www.dmv.org/ca-california/safety-laws.php California traffic laws including California http://www.dmv.org/ca-california/safety-laws.php California law DMV: California Safety Laws: Headlight Laws http://www.dmv.org/ca-california/safety-laws.php according to the Department of Motor Vehicles