Code of Federal Regulations > Title 25 > Chapter I > Part 170 > Subpart D - Subpart D—Planning, Design, and Construction of Tribal Transportation Program Facilities

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

TRANSPORTATION PLANNING

§ 170.400 - What is the purpose of transportation planning?

§ 170.401 - What are BIA's and FHWA's roles in transportation planning?

§ 170.402 - What is the Tribal role in transportation planning?

§ 170.403 - What TTP funds can be used for transportation planning?

§ 170.404 - Can Tribes use transportation planning funds for other activities?

§ 170.405 - How must Tribes use planning funds?

§§ 170.406-170.408 - §[Reserved]

§ 170.409 - What is the purpose of long-range transportation planning?

§ 170.410 - How does a long-range transportation plan relate to the NTTFI?

§ 170.411 - What should a long-range transportation plan include?

§ 170.412 - How is the Tribal TTP long-range transportation plan developed and approved?

§ 170.413 - What is the public's role in developing the long-range transportation plan?

§ 170.414 - How is the Tribal long-range transportation plan used and updated?

§ 170.415 - What are pre-project planning and project identification studies?

§ 170.420 - What is the Tribal priority list?

TRIBAL TRANSPORTATION IMPROVEMENT PROGRAMS

§ 170.421 - What is the Tribal Transportation Improvement Program (TTIP)?

§ 170.422 - How does the public participate in developing the TTIP?

§ 170.423 - How are annual updates or amendments to the TTIP conducted?

§ 170.424 - What is the TTP Transportation Improvement Program (TTPTIP)?

PUBLIC HEARINGS

§ 170.435 - When is a public hearing required?

§ 170.436 - How are public hearings for TTP planning and projects funded?

§ 170.437 - If there is no hearing, how must BIA, FHWA, or a Tribe inform the public?

§ 170.438 - How must BIA, FHWA, or a Tribe inform the public of when a hearing is held?

§ 170.439 - How is a public hearing conducted?

§ 170.440 - How can the public learn the results of a public hearing?

§ 170.441 - Can a decision resulting from a hearing be appealed?

NATIONAL TRIBAL TRANSPORTATION FACILITY INVENTORY

§ 170.442 - What is the National Tribal Transportation Facility Inventory?

§ 170.443 - What is required to successfully include a proposed transportation facility in the NTTFI?

§ 170.444 - How is the NTTFI updated?

§ 170.445 - [Reserved]

§ 170.446 - What minimum attachments are required for an NTTFI submission?

§ 170.447 - How are the allowable lengths of access roads in the NTTFI determined?

ENVIRONMENTAL AND ARCHEOLOGICAL REQUIREMENTS

§ 170.450 - What archeological and environmental requirements must the TTP meet?

§ 170.451 - Can TTP funds be used for archeological and environmental compliance?

§ 170.452 - When can TTP funds be used for archeological and environmental activities?

§ 170.453 - Do the Categorical Exclusions under the National Environmental Policy Act (NEPA) and the regulations at 23 CFR 771 apply to TTP activities?

DESIGN

§ 170.454 - What design standards are used in the TTP?

§ 170.455 -

§ 170.456 - How can a Tribe request an exception from the design standards?

§ 170.457 - Can a Tribe appeal a denial?

REVIEW AND APPROVAL OF PLANS, SPECIFICATIONS AND ESTIMATES

§ 170.460 - What must a project package include?

§ 170.461 - May a Tribe approve plans, specifications, and estimates?

§ 170.463 - What if a design deficiency is identified?

CONSTRUCTION AND CONSTRUCTION MONITORING

§ 170.470 - Which construction standards must Tribes use?

§ 170.471 - How are projects administered?

§ 170.472 - What construction records must Tribes and BIA keep?

§ 170.473 - When is a project complete?

§ 170.474 - Who conducts the project closeout?

MANAGEMENT SYSTEMS

§ 170.502 - Are nationwide management systems required for the TTP?

TRIBAL TRANSPORTATION FACILITY BRIDGES

§ 170.510 - What funds are available for Tribal Transportation Facility Bridge activities?

§ 170.511 - What activities are eligible for Tribal Transportation Facility Bridge funds?

§ 170.512 - How will Tribal Transportation Facility Bridge funds be made available to the Tribes?

§ 170.513 - When and how are bridge inspections performed?

§ 170.514 - Who reviews bridge inspection reports?

Appendix Appendix A - Appendix A to Subpart D of Part 170—Cultural Resource and Environmental Requirements for the TTP

Appendix Appendix B - Appendix B to Subpart D of Part 170—Design Standards for the TTP