23 CFR § 470.101 - Purpose.

---
identifier: "/us/cfr/t23/s470.101"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "23 CFR § 470.101 - Purpose."
title_number: 23
title_name: "Highways"
section_number: "470.101"
section_name: "Purpose."
chapter_name: "FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "E"
subchapter_name: "PLANNING AND RESEARCH"
part_number: "470"
part_name: "HIGHWAY SYSTEMS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "23 U.S.C. 103(b)(2), 103(c), 134, 135, and 315; and 49 CFR 1.85."
regulatory_source: "40 FR 42344, Sept. 12, 1975, unless otherwise noted. Redesignated at 41 FR 51396, Nov. 22, 1976."
cfr_part: "470"
---


# 470.101 Purpose.

This part sets forth policies and procedures relating to the identification of Federal-aid highways, the functional classification of roads and streets, the designation of urban area boundaries, and the designation of routes on the Federal-aid highway systems.