---
kind: "unit"
title: "23"
title_heading: "Highways"
key: "chI/subchE/part450"
level: "part"
label: "Part 450"
heading: "Planning Assistance and Standards"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/23/chI-subchE-part450"
sections_count: 38
---

# Part 450 — Planning Assistance and Standards

Title 23 C.F.R. — Highways › Chapter I — Federal Highway Administration, Department of Transportation › Subchapter E — Planning and Research

## Contents

- [Subpart A — Transportation Planning and Programming Definitions](/cfr/23/chI-subchE-part450-subpartA.md)
- [Subpart B — Statewide and Nonmetropolitan Transportation Planning and Programming](/cfr/23/chI-subchE-part450-subpartB.md)
- [Subpart C — Metropolitan Transportation Planning and Programming](/cfr/23/chI-subchE-part450-subpartC.md)