To access the current version, search for directly on NFPA’s catalog. As of 2025, the active edition is NFPA 502 2023 (or 2026 if recently updated).
The team knew they had to follow the guidelines outlined in the NFPA 502 Standard for Road Tunnels, Bridges, and Other Limited Access Highways. This standard provided critical guidance on the design, construction, and operation of road tunnels, bridges, and other limited access highways. To access the current version, search for directly
Smoke is the leading cause of death in tunnel fires. The standard dictates requirements for: To access the current version