The National Marker Company signs with legend “STOP” and “SLOW” are used to control the flow of traffic at intersections and school crossings. The paddle design makes them easy to be held. They are mostly used by crossing guards to direct cars through a pedestrian crossing area to ensure their safety. Such signs are used at construction sites to protect workers from being struck by moving vehicles in work zones. The signs help protect workers such as emergency responders, clean-up, utility, and construction crews from accidents. The sign uses contrasting colors to ensure better visibility even in poor lighting conditions.