NFPA 502 establishes minimum fire protection and life safety requirements for road tunnels, bridges, and other limited-access highways, serving as a critical guideline for infrastructure design and emergency management. The standard covers essential safety systems, including ventilation for smoke control, structural protection, and emergency egress, with recent updates addressing alternative fuel vehicle hazards. For more information, visit NFPA .

As John and his team arrived on the scene, they could see the smoke billowing out of the tunnel entrance. The fire was intense, and the tunnel was quickly filling with toxic fumes. The firefighters knew they had to act fast to prevent a catastrophe.

NFPA 502, the Standard for Road Tunnels, Bridges, and Other Limited Access Highways, establishes critical fire protection and life safety requirements for complex transportation infrastructure, focusing on structural protection, emergency ventilation, and evacuation. The 2023 edition addresses modern risks, including alternative fuel vehicles and autonomous technologies, while emphasizing risk-informed performance-based design. To review the full standard, visit NFPA .

NFPA 502 is often used alongside: