(1) Whenever ORS 816.040 to 816.290 specify either the distance from which lighting equipment shall render objects visible or the distance within which lighting equipment shall be visible, that distance of visibility, unless a different time or condition is expressly stated, shall be as determined:
(a) Under normal atmospheric conditions;
(b) At any time from sunset to sunrise or any other time when, due to insufficient light, persons and vehicles are not clearly discernible at a distance of 1,000 feet; and
(c) On a straight, level unlighted highway.
(2) Whenever ORS 816.040 to 816.290 specify the mounted height of lighting equipment, the height shall be determined from the center of the lighting equipment to the level ground upon which the vehicle stands.
(3) Any standard provided for a piece of lighting equipment under ORS 816.040 to 816.290 is subject to being superseded by a rule adopted by the Department of Transportation as provided under ORS 815.030. [1983 c.338 §458 (1); 1985 c.16 §240 (1); 1985 c.69 §1 (1); 1985 c.71 §4 (1); 1985 c.393 §13 (1); 1985 c.420 §6 (1); 1995 c.733 §90]