25 CFR 170.454 - What design standards are used in the IRR Program?
(a) Appendix B to this subpart lists design standards that BIA may use for the IRR program.
(b) BIA may also use FHWA-approved State or tribal design standards.
(c) Tribes may propose road and bridge design standards to be used in the IRR Program that are consistent with or exceed applicable Federal standards. The standards may be negotiated between BIA and the tribe and included in a self-determination contract or self-governance agreement.