Federal Trucking Laws: The Complete Guide to FMCSA Regulations
Every federal law and regulation that governs commercial trucking in the United States — from hours of service to CDL requirements to vehicle maintenance standards. Updated for 2026.
Looking for individual pages on each law? See the Federal Trucking Laws Index — full directory of every statute and CFR part ›
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Sell My TruckFederal trucking law isn’t one single law — it’s a layered system built from acts of Congress, regulations written by the Federal Motor Carrier Safety Administration (FMCSA), and enforcement rules administered through the Department of Transportation (DOT). Below is the complete breakdown: the founding statutes, every part of the federal code that governs motor carriers, and what each one actually means for truck owners, drivers, and fleets.
The Federal Statutes That Created Trucking Law
These are the actual Acts of Congress that built the legal foundation FMCSA regulations sit on top of.
| Law | What It Did |
|---|---|
| Motor Carrier Act of 1935 | Gave the federal government its first authority to regulate interstate trucking. |
| Motor Carrier Act of 1980 | Deregulated trucking rates and routes, opening the industry to competition. |
| Motor Carrier Safety Act of 1984 | Created the federal safety mandate that FMCSA regulations are built on. |
| ICC Termination Act of 1995 | Abolished the Interstate Commerce Commission; shifted trucking oversight to DOT. |
| Motor Carrier Safety Improvement Act of 1999 | Formally created FMCSA as its own federal agency, separate from the FHWA. |
| SAFETEA-LU (2005) | Highway funding bill that strengthened motor carrier safety programs and MCSAP funding. |
| MAP-21 (2012) | Created the CSA safety scoring system and registration reforms still used today. |
| FAST Act (2015) | Authorized the ELD mandate and created the Drug & Alcohol Clearinghouse. |
49 CFR Subchapter B: Every Federal Motor Carrier Safety Regulation
This is the complete list of parts within Title 49 of the Code of Federal Regulations that make up the Federal Motor Carrier Safety Regulations (FMCSRs) — the rulebook FMCSA actually enforces day to day. Click any part for the full breakdown.
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Sell My TruckThe 6 Federal Trucking Laws That Matter Most to Truck Owners
Of the 30+ CFR parts above, these six drive day-to-day compliance for an owner-operator or small fleet:
Part 391 — Driver Qualifications
Covers minimum age, medical certification (DOT physical), road test requirements, and the driver qualification file every carrier must maintain for every CMV driver. Incomplete DQ files are the most commonly cited FMCSA compliance review deficiency.
Part 395 — Hours of Service
The 11-hour driving limit within a 14-hour on-duty window, the 30-minute break after 8 hours of driving, and the 60/70-hour weekly limits with 34-hour restart. This is the regulation that drives ELD compliance — HOS violations are the leading cause of out-of-service orders at roadside.
Part 396 — Inspection, Repair, and Maintenance
Requires annual periodic inspections, daily driver vehicle inspection reports (DVIRs — now explicitly allowed electronically as of February 2026), and proper maintenance recordkeeping for every vehicle in the fleet.
Part 382 — Drug and Alcohol Testing
Pre-employment, random, post-accident, and reasonable-suspicion testing requirements, all tied into the FMCSA Drug & Alcohol Clearinghouse. Random testing must cover at least 50% of drivers annually for drugs and 10% for alcohol.
Part 383 — Commercial Driver’s License Standards
Federal minimum standards every state CDL program must meet, including CDL classes (A, B, C), required endorsements, disqualifying offenses, and testing standards. Every driver on your trucks must hold the right CDL class for the vehicle they operate.
Part 387 — Minimum Financial Responsibility
Sets the federally required minimum liability insurance carriers must hold — $750,000 for general freight, up to $5 million for certain hazardous materials. Insurance lapses can result in immediate revocation of operating authority.
Related Federal Rules Outside FMCSA
Not every rule that affects trucking comes from FMCSA. These sit in other parts of the federal code but are equally mandatory for interstate carriers:
- 49 CFR Parts 100–185 — Hazardous Materials Regulations, enforced by PHMSA, not FMCSA. Governs classification, packaging, labeling, and documentation of hazmat shipments.
- IFTA — International Fuel Tax Agreement — quarterly fuel tax reporting through a single base jurisdiction instead of filing in every state.
- IRP — International Registration Plan — the apportioned plate system that replaces separate registrations in every state.
- Federal Bridge Formula — 23 CFR Part 658 — the 80,000 lb. gross weight limit and axle-spacing weight formula for the Interstate Highway System.
- UCR — Unified Carrier Registration — annual registration and fee program for all interstate carriers, brokers, and freight forwarders.
What Changed in Federal Trucking Law in 2026
- ELD enforcement tightened (February 2026): FMCSA finalized a rule explicitly authorizing officers to place a vehicle out of service immediately if it is operating with an ELD that has been removed from the FMCSA Registered ELD List.
- Electronic DVIRs formally confirmed legal (February 2026): FMCSA clarified that electronic driver vehicle inspection reports and electronic signatures from drivers and mechanics fully satisfy the Part 396 requirement — no wet-ink signature required.
- Broker bond liquidity requirements updated (January 2026): Brokers and freight forwarders must maintain their $75,000 surety bond or trust fund in liquid assets, with new trustee eligibility restrictions.
- CSA scoring model rebuilt: FMCSA replaced the old BASIC categories with a leaner peer-comparison model that weights recent violations more heavily and consolidates hundreds of violation codes.
- MC numbers fully retired: FMCSA completed the transition — carriers now operate exclusively under USDOT numbers. MC numbers are no longer issued.
- Federal speed limiter mandate withdrawn: FMCSA and NHTSA formally withdrew the proposed speed limiter rule in a July 2025 Federal Register notice.
Frequently Asked Questions About Federal Trucking Laws
What are the main federal trucking laws in the United States?
Federal trucking regulation is built from Acts of Congress (like the Motor Carrier Safety Act of 1984 and the FAST Act of 2015) and the regulations FMCSA writes under 49 CFR Subchapter B, covering Parts 360 through 399. These cover driver qualifications, hours of service, vehicle maintenance, CDL standards, drug testing, insurance, and more.
What is FMCSA and what does it regulate?
FMCSA (Federal Motor Carrier Safety Administration) is the DOT agency that enforces federal trucking safety regulations for commercial motor carriers, drivers, and vehicles in interstate commerce. It was created as its own agency by the Motor Carrier Safety Improvement Act of 1999 and became operational January 1, 2000.
What is the most enforced federal trucking regulation?
Hours of service under 49 CFR Part 395 is the single most enforced federal trucking regulation. HOS and ELD violations are among the leading causes of trucks being placed out of service at roadside. Driver qualification file deficiencies under Part 391 are the most commonly cited issue in FMCSA compliance reviews.
Do federal trucking laws apply in all 50 states?
Yes — federal trucking regulations apply uniformly across all 50 states for carriers operating in interstate commerce. States can set their own rules for purely intrastate operations, but they cannot impose requirements on interstate carriers that conflict with or fall below federal minimums. This uniform application is one of the primary purposes of federal trucking regulation.
This page is provided for informational purposes only and is not legal advice. Federal trucking regulations change frequently — always verify current requirements directly at fmcsa.dot.gov or with a qualified transportation attorney.
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