Nfpa 502 Standard For Road Tunnels- Bridges- And Other Limited ....pdf ((top)) -

One of the most critical aspects of NFPA 502 is how it classifies tunnels. You cannot treat a 100-meter underpass the same way you treat the Lincoln Tunnel. The standard establishes a graduated scale of requirements based on the length of the tunnel.

NFPA 502: Standard for Road Tunnels, Bridges, and Other Limited Access Highways One of the most critical aspects of NFPA