NFPA 502: Standard for Road Tunnels, Bridges, and Other Limited Access Highways
In the event of a power failure during a fire, lighting becomes a lifeline. NFPA 502 imposes strict electrical requirements. NFPA 502: Standard for Road Tunnels, Bridges, and
Limits are placed on heat exposure, toxic gas concentrations, and visibility to ensure fleeing motorists can safely breathe and see the exits. 2. Fire Detection and Suppression Systems NFPA 502: Standard for Road Tunnels
Mixed into the concrete matrix to prevent explosive spalling during a fire. 4. Egress and Life Safety Systems toxic gas concentrations
