National Marker Company Sign with DANGER - CONSTRUCTION SITE AUTHORIZED PERSONNEL ONLY is a part of safety-related signage that helps to keep a check on the safety and security of potentially dangerous construction sites. This signage restricts the visitors and employees from entering the hazardous zone and allows only the authorized person. This OSHA danger sign is manufactured using premium material that boosts the durability. The text is legible from a distance and the signage can be placed across the busy premises. The Sign Muscle coating over the sign increases the clarity and helps protecting it from environmental damage.