National Marker Company Sign with DANGER - DEMOLITION WORK IN PROGRESS Signage is designed to be placed across the busy construction sites and areas where demolition work is going on. It warns the workers, employees and visitors to keep away from the hazardous zone with potential risks of injury. It is made up of high-grade material that contributes to the durability of the sign. The OSHA danger sign has clear bold text that is visible even from a certain distance and in crowded site. The crystal-clear coating of Sign Muscle boosts the clarity and protects from fading, scuffing, and graffiti.