Title 23 › CHAPTER 1 — FEDERAL-AID HIGHWAYS › § 168
Agencies can use planning work from regional or statewide transportation planning when they do environmental reviews for a project, if the agency in charge of the review and any needed permitting agencies agree. Defined terms: Environmental review process — the formal environmental studies and reviews for a project. Lead agency — the agency running the environmental review. Planning product — a decision, study, or analysis from metropolitan or statewide transportation planning. Project — the transportation project being reviewed. Project sponsor — the group proposing the project. Relevant agency — the agency deciding whether to adopt the planning product. The agency may adopt whole planning products or just parts, and can do that when scoping the review or later. It may use planning decisions (like purpose and need, screening of alternatives, funding approach, or program-level mitigation) and planning analyses (like travel demand, land use, population, environmental conditions, and potential effects). To use a planning product, the agency must find it was made under applicable Federal law, developed with relevant agencies and tribes, considered system-level needs, had public notice that it might be used later, been made available for public comment during the review, have no new significant information, be based on reliable current data and methods, be well documented, meet NEPA rules, and have been approved within 5 years. If adopted, the planning product can be put into NEPA documents and relied on by other Federal agencies. Using planning work this way does not make the planning process itself become an environmental review.
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Highways, Source: USLM XML via OLRC
Legislative History
Reference
Citation
23 U.S.C. § 168
Title 23, Highways
Last Updated
Sep 22, 2026
Release point: 119-110