Motor Carrier Regulations
A plain-language guide to the federal and state regulations governing commercial motor carriers. Citations link to official CFR / federal statute. Not legal advice — consult a transportation attorney for specific situations.
⚠️ Disclaimer: This reference is for general informational purposes only. Regulations change — always verify with FMCSA.dot.gov or consult a qualified transportation attorney. Last reviewed: July 2026.
Registration & Operating Authority
Federal Motor Carrier Safety Regulations — General
Establishes who must comply with FMCSA regulations. Defines commercial motor vehicle (CMV), what operations are regulated, and which carriers are exempt.
MCS-150 — Motor Carrier Identification Report
Requires every motor carrier to file an MCS-150 initially when obtaining a USDOT number, and to update it every two years. Failure results in USDOT number deactivation and civil penalties up to $1,000/day.
Operating Authority (MC Number)
For-hire motor carriers transporting regulated commodities or passengers in interstate commerce must apply for and maintain operating authority in addition to a USDOT number.
BOC-3 — Designation of Process Agents
Every carrier with operating authority must have a BOC-3 on file with FMCSA designating a process agent in every state to receive legal documents on the carrier's behalf.
Unified Carrier Registration (UCR)
UCR — Annual Registration Requirement
All motor carriers, freight brokers, leasing companies, and freight forwarders engaged in interstate or foreign commerce must register and pay UCR fees annually. Registration is based on fleet size (number of power units). Operating without a current UCR registration is a federal violation.
UCR Fleet-Based Fee Structure
Fees are set by the UCR Board and vary by number of power units: 0–2 vehicles, 3–5, 6–20, 21–100, 101–1,000, and 1,001+. Only power units (trucks/tractors) count — trailers are excluded.
Hours of Service (HOS)
Hours of Service of Drivers
Limits driving hours for commercial drivers to prevent fatigue-related accidents. Property carriers: 11-hour driving limit, 14-hour on-duty window, 30-min break after 8 hours, 60/70-hour limits.
Driver Record of Duty Status (RODS) / ELD
All carriers subject to HOS rules must use an Electronic Logging Device (ELD) to record driver duty status. Paper logs only permitted for limited exemptions (short-haul, drive-away operations, etc.).
Drug & Alcohol Testing
Controlled Substances and Alcohol Use and Testing
All employers of CDL drivers subject to FMCSA rules must implement a drug and alcohol testing program. Required tests: pre-employment, random, post-accident, reasonable suspicion, return-to-duty, and follow-up.
FMCSA Drug & Alcohol Clearinghouse
Employers must query the Clearinghouse before hiring CDL drivers and conduct annual queries for current employees. Drivers with drug/alcohol violations must be removed from safety-sensitive functions until completing return-to-duty process.
Driver Qualification Files
Qualifications of Drivers and Longer Combination Vehicles
Sets minimum qualification standards for commercial motor vehicle drivers including physical qualifications (medical exam), driving record requirements, and experience standards.
Driver Qualification File Requirements
Carriers must maintain a DQ file for each driver containing: employment application, MVR inquiry, road test certificate, medical examiner's certificate, documentation of violations, and annual reviews. Files must be retained 3 years after driver leaves.
Tax & Fee Filings
International Fuel Tax Agreement (IFTA)
Carriers operating qualified motor vehicles (2+ axles, GVWR > 26,000 lbs, or 3+ axles regardless of weight) in two or more IFTA jurisdictions must obtain an IFTA license and file quarterly fuel tax returns.
Heavy Vehicle Use Tax (HVUT)
Federal excise tax on highway motor vehicles with a taxable gross weight of 55,000 lbs or more. Filed annually on IRS Form 2290. Proof of payment (Schedule 1) required for vehicle registration.
Safety & Inspection (CSA)
Parts and Accessories / Vehicle Inspection & Maintenance
Carriers must systematically inspect, repair, and maintain all CMVs. Pre-trip inspections required before each trip. Annual inspections required. Drivers must report vehicle defects in writing.
CSA Safety Measurement System (SMS)
FMCSA uses the CSA SMS to measure carrier safety performance across 7 BASICs: Unsafe Driving, HOS Compliance, Driver Fitness, Controlled Substances, Vehicle Maintenance, Cargo-Related, and Crash Indicator. High scores trigger investigation.
State Permits & Registrations
Motor Carrier Permit (MCP) — California
California requires an MCP from the California Department of Motor Vehicles for carriers operating in California in addition to federal USDOT number. CA also imposes specific emissions and weight requirements.
Public Utilities Commission of Ohio (PUCO) Registration
Ohio requires carriers transporting regulated commodities in intrastate commerce to obtain PUCO authority. Different tiers apply depending on cargo type and carrier classification.
CA# Registration
The CA# is a California-specific carrier number required for vehicles operating under California authority. Needed for carriers transporting property for hire within California.
Need Help Staying Compliant?
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