Myth 2: “Older tunnels are exempt.” While new construction has stricter rules, Section 1.4 requires existing tunnels to conduct a fire safety evaluation and implement retrofits where “technically feasible.”
NFPA 502 establishes essential fire protection and life safety requirements for road tunnels, bridges, and limited-access highways, focusing on tenability, structural integrity, and emergency systems. Recent editions incorporate updated guidelines for alternative fuel vehicles and refined safety measures for infrastructure. For the full standard, visit National Fire Protection Association (NFPA) Myth 2: “Older tunnels are exempt