Illumination of conventional outdoor advertising signs. Illumination shall be effectively shielded so as to prevent beams or rays of light from being directed at any portion of the traveled rights-of-way or which is of such intensity or brilliance as to cause glare or impair the vision of the driver of the vehicle, or which interferes with any driver's operation of a vehicle, and illumination shall not be permitted that interferes with the effectiveness or obscures an official traffic signal, device or signal. Advertising signs shall not be permitted that are illuminated by any flashing, intermittent or moving lights except those giving public service information such as time, date, and temperature, weather or similar information.