Ohio Revised Code Title XLV. Motor Vehicles Aeronautics Watercraft § 4513.03

(1) The time from sunset to sunrise;

(2) At any other time when, due to insufficient natural light or unfavorable atmospheric conditions, persons, vehicles, and substantial objects on the highway are not discernible at a distance of one thousand feet ahead;

(3) At any time when the windshield wipers of the vehicle are in use because of precipitation on the windshield.

Every motorized bicycle shall display at such times lighted lights meeting the rules adopted by the director of public safety under section 4511.521 of the Revised Code. No motor vehicle, during any time specified in this section, shall be operated upon a street or highway within this state using only parking lights as illumination.

Whenever in such sections a requirement is declared as to the distance from which certain lamps and devices shall render objects visible, or within which such lamps or devices shall be visible, such distance shall be measured upon a straight level unlighted highway under normal atmospheric conditions unless a different condition is expressly stated.

Whenever in such sections a requirement is declared as to the mounted height of lights or devices, it shall mean from the center of such light or device to the level ground upon which the vehicle stands.