A FLASHING SIGN is any ILLUMINATED SIGN, whether stationary, revolving or rotating, that exhibits changing light or color effects, provided that revolving or rotating SIGNS that exhibit no changing light or color effects other than those produced by revolution or rotation, shall be deemed FLASHING SIGNS only if they exhibit sudden or marked changes in such light or color effects.

ILLUMINATED SIGN that indicate the time, temperature, weather or other similar information shall not be considered FLASHING SIGNS, provided that:

(a) the total SURFACE AREA of such SIGN is not greater than 16 square feet;
(b) the vertical dimension of any letter or number is not greater than 24 inches; and
(c) color or intensity of light is constant except for periodic changes in the information displayed, which occur not more frequently than once every minute.