National Fire Protection Association (NFPA) 'NFPA 502' Standard for Road Tunnels, Bridges, and Other Limited Access Highways.
This standard provides fire protection and fire life safety requirements for limited access highways, road tunnels, bridges, elevated highways, depressed highways, and roadways that are located beneath air-right structures.
https://www.nfpa.org/codes-and-standards/nfpa-502-standard-development/502?l=73
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.nfpa.org/codes-and-standards/nfpa-502-standard-development/502?l=73
www.nfpa.org