Part 392 — Driving of Commercial Motor Vehicles

49 CFR Part 392: The federal rules of the road for commercial drivers — distracted driving, seatbelts, railroad crossings, and more.

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Overview

49 CFR Part 392 governs the actual conduct of driving a commercial motor vehicle — the rules that apply while a driver is at the wheel and on the road. While many FMCSA regulations focus on documentation, qualification, and mechanical compliance, Part 392 addresses how the vehicle must actually be operated.

The most consequential provisions of Part 392 for most carriers are the distracted driving rules. FMCSA prohibits commercial drivers from using a handheld mobile telephone or texting while operating a CMV in interstate commerce. Violations carry civil penalties of up to $2,750 for drivers and up to $11,000 for carriers who allow or require drivers to use handheld devices. Multiple violations can result in CDL disqualification.

Part 392 also requires seatbelt use by drivers and passengers at all times while the CMV is in motion, sets rules for railroad-highway grade crossing procedures, prohibits operating while fatigued or impaired, and addresses cargo securement and other operational requirements that complement the equipment standards in Part 393.

Key Provisions

  • Bans use of handheld mobile phones and texting while operating a CMV — civil penalties up to $2,750 per violation.
  • Requires seatbelt use by driver and all passengers at all times while the CMV is in motion.
  • Sets specific grade crossing procedures for commercial vehicles at railroad crossings.
  • Prohibits operating a CMV while ill, fatigued, or impaired by any substance.
  • Addresses fueling procedures, cargo securement requirements, and emergency equipment use.

Why It Matters to Truck Owners

Part 392 violations are among the most common violations found at roadside inspections and in post-accident investigations. A driver cited for texting at the wheel doesn’t just face a personal fine — the violation goes on the carrier’s CSA record in the Unsafe Driving BASIC. Multiple Part 392 violations can trigger FMCSA compliance reviews. When buying trucks, a vehicle’s inspection history for Part 392 violations tells you about how it was operated.

Frequently Asked Questions

Can a commercial driver use a hands-free phone?

Yes — Part 392 bans handheld mobile phone use, but hands-free devices that can be activated with a single button push and do not require the driver to hold the phone are permitted. The phone must be reachable from the normal seated driving position without leaning. Reaching for a phone, even to use hands-free, is still prohibited.

What are the railroad crossing rules for commercial vehicles?

Under Part 392, certain CMVs must always stop at railroad crossings: vehicles carrying hazardous materials requiring placarding, buses carrying passengers, and vehicles with more than one driving axle or any attached unit. At crossings equipped with gates, all CMVs must stop when the gate is down. Drivers must listen and look in both directions before crossing.

What is the penalty for a commercial driver texting while driving?

FMCSA can impose civil penalties of up to $2,750 on a driver caught texting while operating a CMV. Carriers that allow or require drivers to text can face penalties up to $11,000. Two or more serious traffic violations within 3 years can result in CDL disqualification under Part 383.

Read the official legal text: 49 CFR Part 392 — eCFR.gov (official)

Related Federal Trucking Laws

This page is provided for informational purposes only and is not legal advice. Always verify current requirements at fmcsa.dot.gov or with a qualified transportation attorney.

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