One of the most critical aspects of NFPA 502 is its classification system based on tunnel length. The requirements become more stringent as the tunnel length increases:
According to the standard, road tunnels like this one had to be designed with fire safety features such as:
One of the most critical aspects of NFPA 502 is its classification system based on tunnel length. The requirements become more stringent as the tunnel length increases:
According to the standard, road tunnels like this one had to be designed with fire safety features such as:
