225 ILCS 440/6.02

(a) No sign may be erected which contains, includes or is illuminated by any flashing, intermittent or moving light or lights, except those giving public service information such as, without limiting the generality of the foregoing, time, weather, date and temperature. (b) No sign may be erected or maintained which is not effectively shielded so as to prevent beams or rays of light from being directed at any portion of the traveled way of any Interstate or primary highway or which is of such intensity or brilliance as to cause glare or to impair the vision of the driver of any motor vehicle.