Confirm that the owner or authority requires NFPA 502 and which edition, then trace ventilation, emergency exits, fire protection water, detection, communications, and emergency power along the tunnel or structure through every package. AI can flag conflicts; the engineers of record and the owner decide compliance.
What does NFPA 502 cover?
NFPA 502 is the Standard for Road Tunnels, Bridges, and Other Limited Access Highways. NFPA describes it as providing fire protection and fire life safety requirements for limited access highways, road tunnels, bridges, elevated highways, depressed highways, and roadways located beneath air-right structures.
NFPA’s official NFPA 502 page identifies the 2026 edition as current when checked on October 3, 2026. Confirm the edition, local amendments, and project scope that actually govern the work. The publisher’s newest edition does not establish local adoption.
Transportation owners usually set the governing documents in their own design criteria, which may adopt NFPA 502 with project-specific choices. Record those criteria alongside the standard. Standpipe and fire service water in a tunnel connect to the NFPA 14 and NFPA 24 guides, and radio coverage to the NFPA 1225 guide.
Collect every package along the alignment
Bring the owner’s design criteria, the tunnel or structure general arrangement, the ventilation drawings and operating narrative, the emergency exit and cross-passage drawings, fire protection water and standpipe drawings, detection and alarm drawings, communications and radio drawings, emergency power one-lines, and the drainage drawings for spills.
Align stationing first. Packages from different consultants often use different stationing or reference points, and a conflict at one station is easy to miss if the sheets do not share a reference.
Walk the alignment station by station
| Review question | Sources to compare | Decision to record |
|---|---|---|
| Governing criteria | Owner design criteria, basis of design, specifications | Confirm the edition and any owner choices the drawings rely on. |
| Stationing | General arrangement, every discipline’s key plan | Reconcile station references before comparing locations. |
| Emergency exits | Exit and cross-passage drawings, signage, lighting | Match exit locations, signage, and emergency lighting along the alignment. |
| Ventilation | Ventilation drawings, narrative, controls | Check that fans and operating modes in the narrative are drawn and controlled. |
| Water and standpipes | Fire protection plans, civil plans, hydrant locations | Confirm standpipe outlets and supply connections agree across packages. |
| Communications and power | Radio drawings, emergency power one-lines | Identify life safety systems drawn without an emergency power source. |
Carry emergency power into the NFPA 110 guide and civil questions into the civil and site checklist.
Example: cross-passages at different stations
Hypothetical example. The tunnel general arrangement shows a cross-passage at one station, while the emergency lighting and signage drawings place the exit signs for that passage at a station further along. The two packages use different stationing references.
The general arrangement and the emergency lighting drawings place this cross-passage at different stations. Please confirm the stationing reference used by each package and the passage’s location.
The consultants agree a single stationing reference and revise the lighting and signage drawings. Whether the exit arrangement is acceptable is the engineers’ and owner’s decision.
Review tunnel fire life safety documents with Groundbook
Upload the current project PDFs and relevant specifications to Groundbook. Identify the governing issues and add the applicable NFPA 502 reference from a copy you are licensed to use, where the license permits uploading it. State the edition, amendments, review area, and known exclusions in your instructions.
Compare the general arrangement and owner criteria with the ventilation, exit, fire protection, detection, communications, emergency power, and drainage drawings. Flag stationing, exit, ventilation, water supply, and power information that differs between packages. Use the supplied NFPA 502 edition where applicable and cite both sources.
Groundbook links each potential finding to the sheets behind it. Resolve stationing differences first so later findings refer to the same place.
Document review does not model ventilation or fire scenarios, size systems, or approve the facility. Those decisions remain with the engineers of record, the owner, and the authority having jurisdiction.