A traffic control sign is provided which automatically unfolds and displays the message STOP and displays flashing messages SIGNAL OUT and 4 WAY upon power failure to traditional traffic lights. The traffic control sign includes a pair of sign plates hingedly attached by a pair of hinges. An enfolding assembly is utilized to rotatably enfold and electromagnetically hold the pair of sign plates to a folded position upon resumption of power. The traffic control sign is adapted to be mounted to existing cable or a circular pipe component used for related traditional traffic signal fixtures.