Abstract: An illuminated sign assembly structured to be portable and thereby usable in a variety of applications such as emergency signalling for distressed vehicles. The sign assembly is formed from a flexible material base capable of being folded upon itself and thereby selectively disposed between an open and closed position. Indicia segments, preferably representing alpha-numerical representations are secured to a display face and accented and distinguished from the remainder of the base through a plurality of illuminating light bulbs arranged in spaced apart arrays which correspond to the configuration of the indicia segments. Electrical circuitry is provided for interconnection of the illuminating light bulbs to one another and to a satisfactory electrical power source such as, but not limited to, the electric battery in a conventional automobile.