A roadside warning sign system including sign support comprised of a housing having a top wall, a bottom wall, opposed side walls, an open front face, and an open back face. The housing has a light source disposed interiorly thereof. The light source has a power source. A plurality of signs are provided...http://www.google.se/patents/US6273597?utm_source=gb-gplus-sharePatent US6273597 - Roadside warning sign system
