U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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All TitlesTitle 25Chapter IPart 170Subpart E - Subpart E—Service Delivery for Tribal Transportation Program
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Other legislation and procurement requirements apply to the TTP as shown in the following table:
| Legislation, regulation or other requirement | Applies to Tribes under self-
determination contracts | Applies to Tribes under self-
governance agreements | Applies to Tribes under BIA or FHWA program agreements | Applies to
activities performed by the Secretary |
|---|---|---|---|---|
| Buy Indian Act | No | No | No | Yes. |
| Buy American Act | No | No | No | Yes. |
| Federal Acquisition Regulation (FAR) | No(a) | No | No | Yes. |
| Federal Tort Claims Act | Yes | Yes | Yes | Yes. |
| Davis-Bacon Act | Yes(b) | Yes(b) | Yes(b) | Yes. |
(a) Unless agreed to by the Tribe or Tribal organization under ISDEAA, 25 U.S.C. 450j(a), and 25 CFR 900.115.
(b) Does not apply when Tribe performs work with its own employees.
