---
kind: "unit"
title: "23"
title_heading: "Highways"
key: "chI/subchG/part620"
level: "part"
label: "Part 620"
heading: "Engineering"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/23/chI-subchG-part620"
sections_count: 7
---

# Part 620 — Engineering

Title 23 C.F.R. — Highways › Chapter I — Federal Highway Administration, Department of Transportation › Subchapter G — Engineering and Traffic Operations

## Contents

- [Subpart A — Highway Improvements in the Vicinity of Airports](/cfr/23/chI-subchG-part620-subpartA.md)
- [Subpart B — Relinquishment of Highway Facilities](/cfr/23/chI-subchG-part620-subpartB.md)