Warning signs must be prominently posted at all locations where hazards exist or work activities could create hazards. Signs must be legible from a distance appropriate to the hazard. Common danger sign colors include yellow and black striped for caution, red and white for fire hazards, and various other color combinations for specific hazards. Sign wording must be clear and concise, written in English and any other languages spoken by workers on the job site. Symbols or pictograms can be used to communicate hazards to workers who may not read the posted language. Signs must be maintained in good condition and replaced if faded or damaged. Temporary barricades and caution tape must be used to prevent entry to hazardous areas. Road signs and traffic control devices must comply with the Manual on Uniform Traffic Control Devices (MUTCD) when work affects public roads. Spotters and flaggers must wear high-visibility clothing and use proper hand signals. At night, reflective materials and lighting must ensure signs are visible. Signs must be positioned at appropriate heights and distances from hazards. Hazard-specific signs are required for chemical areas, electrical hazards, moving equipment, and other specific dangers. All workers must be trained to recognize and understand warning signs and signals used on the job site.