---
kind: "unit"
title: "23"
title_heading: "Highways"
key: "chI/subchG/part630"
level: "part"
label: "Part 630"
heading: "Preconstruction Procedures"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/23/chI-subchG-part630"
sections_count: 33
---

# Part 630 — Preconstruction Procedures

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

## Contents

- [Subpart A — Project Authorization and Agreements](/cfr/23/chI-subchG-part630-subpartA.md)
- [Subpart B — Plans, Specifications, and Estimates](/cfr/23/chI-subchG-part630-subpartB.md)
- [Subpart C — Subpart C [Reserved]](/cfr/23/chI-subchG-part630-subpartC.md)
- [Subpart D — Geodetic Markers](/cfr/23/chI-subchG-part630-subpartD.md)
- [Subpart E-F — Subparts E-F [Reserved]](/cfr/23/chI-subchG-part630-subpartE-F.md)
- [Subpart G — Advance Construction of Federal-Aid Projects](/cfr/23/chI-subchG-part630-subpartG.md)
- [Subpart H-I — Subparts H-I [Reserved]](/cfr/23/chI-subchG-part630-subpartH-I.md)
- [Subpart J — Work Zone Safety and Mobility](/cfr/23/chI-subchG-part630-subpartJ.md)
- [Subpart K — Temporary Traffic Control Devices](/cfr/23/chI-subchG-part630-subpartK.md)