---
kind: "unit"
title: "49"
title_heading: "Transportation"
key: "subtB/chIII/subchA/part325"
level: "part"
label: "Part 325"
heading: "Compliance with Interstate Motor Carrier Noise Emission Standards"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/49/subtB-chIII-subchA-part325"
sections_count: 28
---

# Part 325 — Compliance with Interstate Motor Carrier Noise Emission Standards

Title 49 C.F.R. — Transportation › Subtitle B — Other Regulations Relating to Transportation › Chapter III — Federal Motor Carrier Safety Administration, Department of Transportation › Subchapter A — General Regulations

## Contents

- [Subpart A — General Provisions](/cfr/49/subtB-chIII-subchA-part325-subpartA.md)
- [Subpart B — Administrative Provisions](/cfr/49/subtB-chIII-subchA-part325-subpartB.md)
- [Subpart C — Instrumentation](/cfr/49/subtB-chIII-subchA-part325-subpartC.md)
- [Subpart D — Measurement of Noise Emissions; Highway Operations](/cfr/49/subtB-chIII-subchA-part325-subpartD.md)
- [Subpart E — Measurement of Noise Emissions; Stationary Test](/cfr/49/subtB-chIII-subchA-part325-subpartE.md)
- [Subpart F — Correction Factors](/cfr/49/subtB-chIII-subchA-part325-subpartF.md)
- [Subpart G — Exhaust Systems and Tires](/cfr/49/subtB-chIII-subchA-part325-subpartG.md)