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This rulemaking would revise 23 CFR part 650—Bridges, Structures, and Hydraulics—by adding the National Tunnel Inspection Standards (NTIS) under subpart E. We anticipate that the NTIS may be modeled after the existing National Bridge Inspection Standards and may include requirements for, among other things, inspection procedures, the qualifications and training of inspectors, and a National Tunnel Inventory. The FHWA has changed the stage from a final rule to a SNPRM because MAP-21 broadened FHWA´s authority to include all highway tunnels. In addition, it made a number of changes to the NBIS, upon which this rulemaking is based. In order to conform the two processes and to reassess the cost benefit analysis of this rulemaking, a supplemental NPRM is being pursued.