---
kind: "section"
citation: "25 C.F.R. § 170.454"
title: "25"
number: "170.454"
heading: "What design standards are used in the TTP?"
url: "https://uscodex.org/cfr/25/170.454"
---

# §170.454. What design standards are used in the TTP?

- (a) Depending on the nature of the project, Tribes must use appropriate design standards approved by FHWA. Appendix B to this subpart as well as the official Tribal Transportation Program Guide list the applicable design standards that can be used.
- (b) All other design standards not listed in (a) must receive approval from FHWA.

## Notes

### Authority

Authority: Pub. L. 112-141, Pub. L. 114-94; 5 U.S.C. 2; 23 U.S.C. 201, 202; 25 U.S.C. 2, 9.

### Source

Source: 81 FR 78463, Nov. 7, 2016, unless otherwise noted.