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Limited-access highways, tunnels, bridges, elevated highways, and air right structures present unique fire protection challenges. NFPA 502: Standard for Road Tunnels, Bridges, and Other Limited Access Highways provides designers, AHJs, and state and federal regulators with guidelines for the construction, operation, maintenance, and fire protection of these venues to mitigate hazards, maintain structural integrity, and protect lives. Topics covered include traffic control, standpipe and water supply, control of hazardous materials, emergency ventilation, electrical systems, and emergency response.