---
kind: "section"
citation: "25 C.F.R. § 170.455"
title: "25"
number: "170.455"
heading: "What other factors must influence project design?"
url: "https://uscodex.org/cfr/25/170.455"
---

# §170.455. What other factors must influence project design?


The appropriate design standards must be applied to each construction project consistent with a minimum 20-year design life for highway projects and 75-year design life for highway bridges. The design of TTP projects must take into consideration:

- (a) The existing and planned future use of the facility in a manner that is conducive to safety, durability, and economy of maintenance;
- (b) The particular needs of each locality, and the environmental, scenic, historic, aesthetic, community, and other cultural values and mobility needs in a cost effective manner; and
- (c) **Access and accommodation for other modes of transportation.**

## 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.