National Marker Company sign with legend ?CAUTION ? CONSTRUCTION AREA ? AUTHORIZED PERSONNEL ONLY? can be used at construction sites and clearly informs visitors or workers that entry in the specific area is restricted to authorized personnel only. It helps enforce health and safety standards for workers. The caution sign is compliant with OSHA standards and displays the message in yellow text on black base with black text on a yellow base. The material is UV resistant, chemical resistant, graffiti proof and has NMC Sign Muscle coating that protects the text against fading, scratches, scuffing, mold, and moisture.