CFR > Title 25 - Indians > CHAPTER I—BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR > SUBCHAPTER H—LAND AND WATER (parts 150 to 183) > PART 170—INDIAN RESERVATION ROADS PROGRAM > SUBPART D—Planning, Design, and Construction of Indian Reservation Roads Program Facilities (§170.400 to §170.507) > 170.470—What are the IRR construction standards?

170.470—What are the IRR construction standards?

(a) Appendix B to this subpart lists design standards that may be used for roads and bridges.
(1) Tribes may propose road and highway bridge construction standards that are consistent with or exceed these standards.
(2) BIA may also use FHWA-approved, State or tribal road and highway bridge construction standards.
(b) For designing and building eligible intermodal projects funded by the IRR Program, tribes must use either:
(1) Nationally recognized standards for comparable projects; or
(2) Tribally adopted standards that meet or exceed nationally recognized standards for comparable projects.