(a) Every vehicle upon a street or highway during the time from one-half hour after sunset to one-half hour before sunrise, and at any other time when there are unfavorable atmospheric conditions or when there is not sufficient natural light to render discernible persons, vehicles and substantial objects on the street at a distance of 1,000 feet ahead, shall display lighted lights and illuminating devices as required by this chapter for different classes of vehicles, except that every motorized bicycle shall display at such times lighted lights meeting the rules adopted by the Ohio Director of Public Safety under Ohio R.C. 4511.521. No motor vehicle, during such times, shall be operated upon a street or highway using only parking lights as illumination.
(b) Whenever in such sections a requirement is declared as to the distance from which certain lights and devices shall render objects visible, or within which such lights or devices shall be visible, such distance shall be measured upon a straight level unlighted street under normal atmospheric conditions unless a different condition is expressly stated.
(c) 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. (ORC 4513.03)