Site Feedback

Title 25

Displaying title 25, up to date as of 10/15/2026. Title 25 was last amended 12/01/2025.
eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

Learn more about the eCFR, its status, and the editorial process.

Title 25IndiansPart / Section
Chapter IBureau of Indian Affairs, Department of the Interior1 – 299
Subchapter HLand and Water150 – 183
Part 170Tribal Transportation Program170.1 – 170.942
Subpart DPlanning, Design, and Construction of Tribal Transportation Program Facilities170.400 – 170.514
Transportation Planning170.400 – 170.420
§ 170.400What is the purpose of transportation planning?
§ 170.401What are BIA's and FHWA's roles in transportation planning?
§ 170.402What is the Tribal role in transportation planning?
§ 170.403What TTP funds can be used for transportation planning?
§ 170.404Can Tribes use transportation planning funds for other activities?
§ 170.405How must Tribes use planning funds?
§§ 170.406-170.408 [Reserved]
§ 170.409What is the purpose of long-range transportation planning?
§ 170.410How does a long-range transportation plan relate to the NTTFI?
§ 170.411What should a long-range transportation plan include?
§ 170.412How is the Tribal TTP long-range transportation plan developed and approved?
§ 170.413What is the public's role in developing the long-range transportation plan?
§ 170.414How is the Tribal long-range transportation plan used and updated?
§ 170.415What are pre-project planning and project identification studies?
§ 170.420What is the Tribal priority list?
Tribal Transportation Improvement Programs170.421 – 170.424
§ 170.421What is the Tribal Transportation Improvement Program (TTIP)?
§ 170.422How does the public participate in developing the TTIP?
§ 170.423How are annual updates or amendments to the TTIP conducted?
§ 170.424What is the TTP Transportation Improvement Program (TTPTIP)?
Public Hearings170.435 – 170.441
§ 170.435When is a public hearing required?
§ 170.436How are public hearings for TTP planning and projects funded?
§ 170.437If there is no hearing, how must BIA, FHWA, or a Tribe inform the public?
§ 170.438How must BIA, FHWA, or a Tribe inform the public of when a hearing is held?
§ 170.439How is a public hearing conducted?
§ 170.440How can the public learn the results of a public hearing?
§ 170.441Can a decision resulting from a hearing be appealed?
National Tribal Transportation Facility Inventory170.442 – 170.447
§ 170.442What is the National Tribal Transportation Facility Inventory?
§ 170.443What is required to successfully include a proposed transportation facility in the NTTFI?
§ 170.444How is the NTTFI updated?
§ 170.445 [Reserved]
§ 170.446What minimum attachments are required for an NTTFI submission?
§ 170.447How are the allowable lengths of access roads in the NTTFI determined?
Environmental and Archeological Requirements170.450 – 170.453
§ 170.450What archeological and environmental requirements must the TTP meet?
§ 170.451Can TTP funds be used for archeological and environmental compliance?
§ 170.452When can TTP funds be used for archeological and environmental activities?
§ 170.453Do the Categorical Exclusions under the National Environmental Policy Act (NEPA) and the regulations at 23 CFR 771 apply to TTP activities?
Design170.454 – 170.457
§ 170.454What design standards are used in the TTP?
§ 170.455What other factors must influence project design?
§ 170.456How can a Tribe request an exception from the design standards?
§ 170.457Can a Tribe appeal a denial?
Review and Approval of Plans, Specifications and Estimates170.460 – 170.463
§ 170.460What must a project package include?
§ 170.461May a Tribe approve plans, specifications, and estimates?
§ 170.463What if a design deficiency is identified?
Construction and Construction Monitoring170.470 – 170.474
§ 170.470Which construction standards must Tribes use?
§ 170.471How are projects administered?
§ 170.472What construction records must Tribes and BIA keep?
§ 170.473When is a project complete?
§ 170.474Who conducts the project closeout?
Management Systems170.502
§ 170.502Are nationwide management systems required for the TTP?
Tribal Transportation Facility Bridges170.510 – 170.514
§ 170.510What funds are available for Tribal Transportation Facility Bridge activities?
§ 170.511What activities are eligible for Tribal Transportation Facility Bridge funds?
§ 170.512How will Tribal Transportation Facility Bridge funds be made available to the Tribes?
§ 170.513When and how are bridge inspections performed?
§ 170.514Who reviews bridge inspection reports?
Appendix A to Subpart D of Part 170
Cultural Resource and Environmental Requirements for the TTP
Appendix B to Subpart D of Part 170
Design Standards for the TTP