---
kind: "unit"
title: "49"
title_heading: "Transportation"
key: "subtB/chIII/subchB/part393"
level: "part"
label: "Part 393"
heading: "Parts and Accessories Necessary for Safe Operation"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/49/subtB-chIII-subchB-part393"
sections_count: 90
---

# Part 393 — Parts and Accessories Necessary for Safe Operation

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

## Contents

- [Subpart A — General](/cfr/49/subtB-chIII-subchB-part393-subpartA.md)
- [Subpart B — Lamps, Reflective Devices, and Electrical Wiring](/cfr/49/subtB-chIII-subchB-part393-subpartB.md)
- [Subpart C — Brakes](/cfr/49/subtB-chIII-subchB-part393-subpartC.md)
- [Subpart D — Glazing and Window Construction](/cfr/49/subtB-chIII-subchB-part393-subpartD.md)
- [Subpart E — Fuel Systems](/cfr/49/subtB-chIII-subchB-part393-subpartE.md)
- [Subpart F — Coupling Devices and Towing Methods](/cfr/49/subtB-chIII-subchB-part393-subpartF.md)
- [Subpart G — Miscellaneous Parts and Accessories](/cfr/49/subtB-chIII-subchB-part393-subpartG.md)
- [Subpart H — Emergency Equipment](/cfr/49/subtB-chIII-subchB-part393-subpartH.md)
- [Subpart I — Protection Against Shifting and Falling Cargo](/cfr/49/subtB-chIII-subchB-part393-subpartI.md)
- [Subpart J — Frames, Cab and Body Components, Wheels, Steering, and Suspension Systems](/cfr/49/subtB-chIII-subchB-part393-subpartJ.md)