A. If a requirement is provided in this article as to the distance from which certain lamps and devices shall render objects visible or within which the lamps or devices shall be visible, the provisions apply during the times stated in section 28-922 with respect to a vehicle without a load when on a straight, level and unlighted highway under normal atmospheric conditions unless a different time or condition is expressly provided.

B. If a requirement is provided in this article for the mounted height of lamps or devices it means from the center of the lamp or device to the level ground on which the vehicle stands when the vehicle is without a load.