Let’s Put The Safety Back Into The FMCSA

Freight Culture Standard | August 2026

Part I: The Regulation Count

The Federal Motor Carrier Safety Administration (FMCSA) regulates commercial trucking through 37 active parts in Title 49, Code of Federal Regulations (CFR), Chapter III. That is the whole regulatory universe. Registration, insurance, brokers, household goods, hazardous materials paperwork, rulemaking procedure, all of it lives in those 37 parts.

Six of them touch the driver’s body, fitness, or impairment directly: Part 380 (Special Training Requirements), Part 382 (Controlled Substances and Alcohol Testing), Part 391 (Qualifications of Drivers), Part 392 (Driving of Commercial Motor Vehicles), Part 395 (Hours of Service), and Part 399 (Employee Safety and Health Standards).

Those six parts contain 168 active sections, counted section by section directly from the electronic Code of Federal Regulations (eCFR), not estimated. 175 counting appendices.

That’s roughly one in four FMCSA regulatory parts. The other three in four cover carrier registration, broker rules, household goods, financial responsibility, and paperwork. Whether that ratio is right or wrong is a judgment call. This brief hands you the real number and the real breakdown, then gets out of the way.

This count is not finished. 20 of the 37 parts have exact, primary-sourced section counts as of this brief. 17 do not. Naming them instead of rounding past them:

• Part 374, Passenger Carrier Regulations
• Part 375, Transportation of Household Goods in Interstate Commerce, Consumer Protection Regulations
• Part 376, Lease and Interchange of Vehicles
• Part 377, Payment of Transportation Charges
• Part 378, Procedures Governing Overcharge, Duplicate Payment, or Overcollection Claims
• Part 379, Preservation of Records
• Part 381, Waivers, Exemptions, and Pilot Programs
• Part 383, Commercial Driver’s License Standards, Requirements and Penalties
• Part 384, State Compliance with Commercial Driver’s License Program
• Part 385, Safety Fitness Procedures
• Part 386, Rules of Practice for FMCSA Proceedings
• Part 387, Minimum Levels of Financial Responsibility for Motor Carriers
• Part 389, Rulemaking Procedures
• Part 390, Federal Motor Carrier Safety Regulations, General
• Part 393, Parts and Accessories Necessary for Safe Operation
• Part 396, Inspection, Repair, and Maintenance
• Part 397, Transportation of Hazardous Materials, Driving and Parking Rules
• Part 398, Transportation of Migrant Workers

None of these 17 govern the driver’s body, fitness, or impairment directly. Several, Part 385, Part 393, Part 396, Part 397, touch safety indirectly through vehicle equipment, maintenance, and carrier safety fitness ratings. Those are carrier and vehicle regulations, not driver regulations, and this brief holds that line rather than blur it for a bigger number.

What follows is a section-by-section breakdown of what each of the six driver-safety parts regulates, and, in several places, what it doesn’t.

Part II: Part 380, Special Training Requirements

Part 380 covers entry-level driver training (ELDT), longer combination vehicle driver training, and the training provider registry. 31 sections, 6 appendices.

ELDT mandates hours-of-service and safety-topic training. It has no wellness or health-mitigation content requirement at all. A fully compliant curriculum never has to mention fatigue physiology, cranking or seat ergonomics, or mental health, not once.

There’s no federal minimum number of training hours for initial commercial driver’s license (CDL) licensure. And separately, there’s no recertification exam ever, at any point in a driver’s career. Compare that to other regulated safety professions. Airline pilots sit simulator proficiency checks every 6 months and line checks every 24 months. Nuclear reactor operators pass an annual written and operating exam inside a rolling 24-month requalification cycle. Physicians face formal reassessment every 6 to 10 years. A CDL issued in 1998 is identical, on paper, to one issued in 2024. Nothing re-tests either driver.

FMCSA built a fatigue and wellness training model twice, and let it lapse both times. The first was the 1996 “Mastering Alertness and Managing Driver Fatigue” program. The second was the June 2000 joint program with the National Private Truck Council and the American Trucking Associations Foundation, which produced an actual model wellness curriculum. A documented 500-truck fleet case study saw a 40% accident reduction under a fatigue and health program built on that model. Then the program’s champion left the company, ownership moved to a risk management group with no stake in it, and the fleet stopped running it.

Sources: FMCSA Entry-Level Driver Training regulations, 49 CFR Part 380; Transportation Research Board retrospective on FMCSA driver wellness research; FMCSA/National Private Truck Council/American Trucking Associations (ATA) Foundation, Design, Development, and Evaluation of Truck and Bus Driver Wellness Programs, June 2000; FAA 14 CFR Part 61 pilot currency requirements; Nuclear Regulatory Commission (NRC) 10 CFR Part 55 operator licensing; American Board of Medical Specialties continuing certification standards.

Part III: Part 382, Controlled Substances and Alcohol Testing

Part 382 covers pre-employment, random, post-accident, reasonable-suspicion, and return-to-duty drug and alcohol testing, plus the Drug and Alcohol Clearinghouse. 55 sections.

Random testing rates run 50% annually for controlled substances and 10% for alcohol, both maintained through 2026. Marijuana accounts for roughly 60% of all Clearinghouse positives since 2020. As of early 2026, more than 200,000 CDL holders sit in prohibited status, and 78.7% of them have made no return-to-duty move at all.

One loophole closed. Before November 2024, a driver flagged as prohibited in the federal Clearinghouse could still hold a valid-looking CDL and simply move to a state whose licensing system hadn’t caught up. The Clearinghouse II final rule closed that gap. State licensing agencies must now query the Clearinghouse before issuing, renewing, transferring, or upgrading any CDL, and must downgrade a prohibited driver’s license within 60 days.

One loophole still open, and it’s the sharpest unresolved finding in this section. Congress directed the Department of Health and Human Services (HHS), in the Fixing America’s Surface Transportation (FAST) Act of 2015, to issue guidelines allowing hair testing as an alternative to urine testing for federal drug programs. Eleven years later, HHS still hasn’t finalized them. FMCSA has denied at least one direct industry petition to allow hair-test results into the Clearinghouse, on the grounds that it has no statutory authority to act until HHS finishes its work. That’s a real, documented statutory chokepoint, not agency foot-dragging.

Hair testing as a Clearinghouse-eligible method is current law’s unfinished business. Permitted in principle once HHS finalizes its guidelines. Not enforceable today, because no HHS-certified hair-testing labs or protocol exist yet. Carriers that want to catch what urine testing misses have to pay for both tests, can’t act on a hair-only positive through the federal system, and the driver who fails a hair test but passes urine keeps a clean federal record and can walk to the next carrier.

The Trucking Alliance, a group representing more than 70,000 trucks that has been lobbying for this change, says roughly 11 times more drivers fail a hair test than fail the Department of Transportation (DOT) required urine test. That figure is real and traceable to a named source. It’s also an interested party’s own number, offered in support of a specific regulatory outcome they want, not an independently verified study. Worth citing as “Trucking Alliance says,” not as settled fact.

One place this brief should say the US framework holds up. Australia’s Heavy Vehicle National Law, overhauled in 2026, runs a less prescriptive drug and alcohol testing structure than Part 382. That’s one of the few spots in this whole brief where the American rule comes out ahead.

Sources: 49 CFR Part 382; FMCSA Drug and Alcohol Clearinghouse monthly reports, 2026; Clearinghouse II final rule, 86 FR 55718; FAST Act of 2015, Public Law 114-94; HHS proposed Hair Mandatory Guidelines for Federal Workplace Drug Testing Programs, September 2020 and 2025 reissue; FMCSA denial of Trucking Alliance hair-testing petition, December 2022; Trucking Alliance public statements via The Trucker and Heavy Duty Trucking; Australian Heavy Vehicle National Law 2026 reform materials, National Heavy Vehicle Regulator.

Part IV: Part 391, Qualifications of Drivers

Part 391 sets the 13-category physical qualification standard at 391.41, governs medical examiner certification, and runs the National Registry of Certified Medical Examiners. 27 sections. This is the deepest well of the six parts.

For most of the 13 categories, the regulation sets an outcome standard with no required clinical protocol behind it. FMCSA’s own Medical Examiner Handbook says examiners “may or may not choose to use” the advisory criteria. Deviating from them isn’t a violation.

Before 2014, any licensed healthcare professional could conduct CDL exams with zero FMCSA-specific training. The National Registry, finalized in 2012 and effective 2014, fixed the examiner’s qualifications. It didn’t fix the exam’s rigor.

A 2021 Department of Transportation Office of Inspector General (OIG) audit found that 46% of the Registry’s 70,208 examiner records had outdated license information. FMCSA wasn’t running annual eligibility audits. The OIG’s own words: FMCSA “may be missing fraud indicators” and has “less assurance that drivers are physically qualified.”

The fraud record bears that out. An Alabama examiner sentenced to prison in 2019 forced 2,100-plus drivers to re-certify. In April 2025, FMCSA voided 15,225 unexpired certificates issued by two Houston chiropractors, the largest single voiding event in Registry history.

The exam itself runs fee-for-service. The driver pays. The examiner who disqualifies drivers loses volume to a more permissive competitor down the road. Nothing caps certification volume. Nothing requires documentation of a borderline call outside an audit.

And the certificate reflects one day. A 24-month cycle means nothing monitors what happens to a driver’s blood pressure, heart, or condition in the 23 months and 29 days after the exam. A June 2025 rule closed the loophole where a disqualified driver could shop for a second, more permissive examiner, but only going forward, not retroactively.

The physical fitness of the population this exam is supposed to catch: 69% of drivers report obesity against 31% of the general working population. 51% smoke against 19% general population. 61% carry two or more major cardiovascular risk factors. A quarter have never had their cholesterol checked. Average verified sleep during the mandated rest period runs 4.78 hours against a 7-hour recommended minimum, a gap that only partially closed even after the rest window was extended specifically to fix it.

Obstructive sleep apnea (OSA) is the condition that doesn’t fit neatly into any one category, so it belongs here as the qualification gap it is. An FMCSA-and-industry-commissioned estimate puts OSA prevalence at 28% of commercial drivers. Untreated, 8 hours of sleep with OSA can be less restorative than 4 hours without it. A 2016 proposed rule on OSA screening was withdrawn in 2017 without a final rule. A 2013 federal law locks FMCSA into formal rulemaking only for this specific issue, no guidance shortcut exists. An advisory body’s 2016 recommendation, automatic referral for drivers with a body mass index of 40 or higher, was never made binding. Carriers that screen for OSA voluntarily report measurable safety improvements. Nobody’s required to, so cost keeps most from doing it.

Two more fold-ins belong here, both because 391.41 is where the driver’s body gets checked, even though neither is regulated as an exposure or a condition in its own right.

Whole-body vibration. No federal rule anywhere regulates it as an exposure, not in Part 391, not in Part 393, not anywhere in Occupational Safety and Health Administration (OSHA) regulation. But musculoskeletal integrity is one of the 13 qualification categories, and chronic low back pain and disc degeneration from years of vibration exposure are exactly what that category exists to catch after the fact. 72.5% of drivers report low back pain. The National Institute for Occupational Safety and Health (NIOSH) gave the vibration-to-back-pain link its highest evidence rating in 1997. The European Union (EU) has bound whole-body vibration exposure since 2002. The United States has nothing, at any point in that chain, from exposure limit to qualification check.

Mental fitness and the suicide data. 391.41 includes “mental disorders likely to interfere with safe operation” as a qualification category. FMCSA’s own 2009 Psychiatric Medical Expert Panel, convened specifically to review psychiatric certification standards, recommended adding a validated 2-question depression screener to the medical exam, with a specific referral trigger: a positive screen sends the driver to a psychiatrist for evaluation that includes suicidal ideation and attempt history. That recommendation is on FMCSA’s own letterhead, from FMCSA’s own panel, in 2009. It was never adopted. The current, binding advisory criteria contain no depression screening tool of any kind. What they say: individuals “highly susceptible to frequent states of emotional instability” are unlikely to qualify, and examiners should weigh medication side effects. No structured tool populates the category. An examiner has to notice emotional instability unprompted.

On the underlying suicide numbers, precision matters more than a scarier headline. The Centers for Disease Control and Prevention’s (CDC) most recent occupational data places Transportation and Material Moving, the broader category most truck drivers fall under, 4th among major occupational groups for men, at 30.4 per 100,000 against an 18.0 general working-age rate. Not first. Not fifth, despite what circulates in trade press. Separately, the Bureau of Labor Statistics (BLS) found heavy and tractor-trailer drivers had the highest raw count of workplace suicides of any single detailed occupation, 46 over a 3-year study period, but a low propensity ratio of 0.40, meaning that count reflects the size of the occupation, not an outsized rate within it.

Montgomery v. Caribe Transport II, decided unanimously by the Supreme Court in May 2026, eliminated the federal preemption defense freight brokers had used to defeat negligent-hiring claims. A carrier whose drivers are certified through a flagged or removed examiner now hands any broker or shipper a publicly searchable liability trail.

Sources: 49 CFR 391.41, 391.43, Appendix A; FMCSA Medical Examiner Handbook, January 2024 edition; National Registry of Certified Medical Examiners final rule, 77 FR 24104; DOT Office of Inspector General audit, January 2021; FreightWaves and Lewis Brisbois coverage of April 2025 certificate voiding; NIOSH National Survey of U.S. Long-Haul Truck Driver Health and Injury, 2014; Mitler et al., New England Journal of Medicine, 1997; FMCSA/American Transportation Research Institute (ATRI) commissioned OSA prevalence study; Public Law 113-45, 2013; FMCSA Medical Review Board and Motor Carrier Safety Advisory Committee 2016 OSA recommendations; EU Directive 2002/44/EC; NIOSH 1997 whole-body vibration evidence review; FMCSA Psychiatric Medical Expert Panel report, 2009; CDC Suicide Rates by Industry and Occupation, National Violent Death Reporting System, 2016; BLS Suicide in the Workplace, Monthly Labor Review; Montgomery v. Caribe Transport II, LLC, No. 24-1238, 608 U.S. ___ (May 14, 2026).

Part V: Part 392, Driving of Commercial Motor Vehicles

Part 392 governs conduct behind the wheel: the ill or fatigued operator prohibition at 392.3, drug and alcohol prohibitions, seat belts, carbon monoxide, radar detectors, and handheld phone use. 32 sections.

FMCSA’s own definition of driver fatigue explicitly includes mental exertion, not just physical. The enforcement mechanism, hours of service, measures only time. Nothing measures cognitive state. Eleven hours in stop-and-go traffic across three states is not the same shift as 11 hours on an empty interstate at 2 AM. Both are identically compliant under the clock.

Not even commercial aviation, the industry with the most rigorous fatigue regulation in the country, has a cognitive-load threshold. What it has is a Fatigue Risk Management System requirement that obligates carriers to manage the risk, not just log the hours. Trucking has voluntary FMCSA guidance and no requirement.

392.66 governs carbon monoxide (CO), and the regulation is entirely reactive. It prohibits driving once CO is detected. No mandate to install detectors. No cab-air exposure limit. No systematic exhaust-integrity inspection beyond the pre-trip checklist. An Australian driver with 40 years behind the wheel was blood-tested at medium-smoker-equivalent CO levels 12 hours after driving a near-new truck, and has since been diagnosed with focal epilepsy and early-stage dementia he attributes to chronic low-level exposure. Washington State’s Department of Labor and Industries documented a driver poisoned in the sleeper berth by a faulty bunk heater in 2024, exhaust entering the cab with windows and vents closed. CO exposure also compounds noise-induced hearing loss at a physiological level, a documented interaction with zero regulatory response from any agency.

One more piece belongs here. Driver monitoring systems, camera-based technology that detects drowsiness and distraction in real time, are commercially available and mandated in the European Union for heavy vehicles by July 2026. They detect the exact state 392.3 already prohibits. Nothing requires them here.

Sources: 49 CFR 392.3, 392.66; FMCSA CMV Driving Tips: Driver Fatigue; 14 CFR Part 117 flight and duty limitations; FAA/NATCA agreement on air traffic controller rest requirements, April 2024; personal account, Dave Leech, 40-year Australian commercial driver; Washington State Department of Labor and Industries safety research report, June 2024; EU General Safety Regulation 2019/2144 driver monitoring system mandate.

Part VI: Part 395, Hours of Service

Part 395 is the largest body of regulation among the six, 17 sections plus one appendix, and the largest body of research in this brief. The throughline across all of it: compliance with the clock is not the same thing as fitness to drive.

The current framework rests on four interacting limits. 11 hours of driving following 10 consecutive hours off duty. A 14-hour on-duty window from shift start. A 30-minute break after 8 consecutive hours of driving. 60 or 70 hours weekly, with a 34-hour restart.

A driver awake 17 to 18 hours before getting behind the wheel operates at an impairment level equivalent to a blood alcohol concentration of 0.05%. At 24 hours awake, that reaches 0.10%, above the legal limit for commercial operation. Hours of service doesn’t measure how long a driver was awake before the clock started.

The circadian nadir, roughly 2 to 6 AM, produces maximum impairment regardless of compliance. A compliant driver in hour 6 of an overnight run at 4 AM is not the same driver, physiologically, as a compliant driver in hour 6 at 10 AM. The rule treats them identically.

Crash rate roughly doubles between hour 10 and hour 11 to 12 of driving. FMCSA’s own 2005 rulemaking found no research basis to move the 11-hour limit either direction. The federal fatigue-crash estimate everyone still cites, 13% of fatal and injury large-truck crashes, comes from a study built on data collected between 2001 and 2003. It has never been repeated at that depth. The National Transportation Safety Board’s broader estimate runs 30% to 40%. Nobody agrees on the real number, and the study everyone cites is 23 years old.

Most long-haul drivers are paid by the mile. They aren’t paid for rest breaks. Detention, dock waits, and weather holds burn the 14-hour window without generating income, creating direct financial pressure to compress rest into whatever time is left. Dispatchers function as the day-to-day fatigue managers in practice, and where their incentive is load coverage rather than safety, the pressure runs the wrong direction.

The exemption structure carves out real coverage gaps. Agricultural transport within a 150 air-mile radius during planting and harvest gets no hours-of-service coverage at all. Short-haul operations within the same radius carry no electronic logging device (ELD) requirement. A driver hauling grain 14 straight hours inside the exempt zone is exactly as physiologically impaired as a regulated driver over the 11-hour limit. The exemption doesn’t touch the physiology, only the paperwork.

ELDs, mandated under 395.8, ended paper-log falsification. They record duty status and vehicle movement. They don’t record speed at a given moment, distraction, impairment, or what the driver was doing in the seconds before a crash. A driver can be fully compliant and fully impaired at the same time, and the ELD record shows nothing wrong.

What “off duty” means inside the mandated 10 hours deserves its own scrutiny. Verified sleep during that window ran 4.78 hours in the original 1997 study, improving only to 6.3 hours a decade later, after the rest window was extended specifically to address the shortfall. Day-sleeping drivers, fighting sunrise light exposure, average closer to 4.5 hours. The only federal standard governing the sleeping space itself addresses size alone, nothing on noise, temperature, vibration, or light. Truck stop parking lots run at or above the noise level that triggers mandatory hearing protection in a fixed workplace, while a sleeping brain needs a fraction of that noise level to rest. A federal circuit court, in Montoya v. CRST Expedited, already found that sleeper berth time exceeding 8 hours in a day was compensable work time under the Fair Labor Standards Act, meaning a court has ruled that FMCSA’s own “off duty” label doesn’t meet the Department of Labor’s own definition of off duty.

Two pilot programs launched in 2025 test real regulatory movement: a Split Duty Period pilot that would pause the 14-hour clock for detention time, and a Flexible Sleeper Berth pilot testing new split configurations. Both remain in pre-test phase as of this brief, years from a final rule.

Normalization of deviance shows up here too. A driver who runs 30 minutes over once, unremarked, becomes a driver for whom 30 minutes over is just how he runs. No memo, no policy change. The standard gets reclassified by silence.

Sources: 49 CFR Part 395; Dawson D, Reid K, Fatigue, Alcohol and Performance Impairment, Nature, 1997; FMCSA Large Truck Crash Causation Study, 2001-2003; FMCSA 2005 Hours of Service final rule; NTSB Factors That Affect Fatigue in Heavy Truck Accidents, SS-95/02, 1995; American Transportation Research Institute, Pay Incentives and Truck Driver Safety; Mitler et al., New England Journal of Medicine, 1997; Hanowski et al., FMCSA naturalistic driving study, 2007; Montoya v. CRST Expedited Inc., 1st Cir., No. 21-1125, December 12, 2023; Federal Register, Split Duty Period and Flexible Sleeper Berth pilot program notices, September 2025.

Part VII: Part 399, Employee Safety and Health Standards

Part 399 has 6 active sections. That’s the entire content of the part, and the finding here is the sharpest in this brief.

Subparts A through K of Part 399 are reserved, empty. The entire active content is Subpart L, step, handhold, and deck requirements, and Subpart L is narrower than its title suggests. Its own applicability section states it plainly: the subpart applies to trucks and truck-tractors having a “high profile cab-over-engine (COE) configuration,” manufactured on or after September 1, 1982. Not all trucks. Not all truck-tractors. Only high-profile cab-over-engine ones.

The date is the tell. The Surface Transportation Assistance Act of 1982, passed the same year this standard’s applicability date kicks in, eliminated the federal length restriction on tractor-trailer combinations and started regulating trailer length independently. That single change removed the cab-over-engine truck’s entire commercial rationale in the United States almost overnight. Carriers no longer needed a short cab to fit a legal-length trailer. Conventional, long-nose tractors had come to dominate the American long-haul fleet almost completely by the early 1990s. Cab-over-engine trucks are now rare in the US, kept alive mostly as a niche and a collector’s interest, still common in Europe and Australia where length rules stayed strict. Within about a decade of this safety standard’s effective date, the vehicle configuration it was written for had largely disappeared from American roads. Nobody ever rewrote it to reach the conventional cabs that replaced it.

And even within its narrow scope, the rule doesn’t reach the trailer. 399.207 governs cab entry and exit and the tractor’s own rear coupling deck, where air and electrical lines connect to the trailer, not the trailer itself. The regulation’s own exception clause makes this explicit: if those coupling connections are reachable from the ground, no steps or handholds are required at all. A check of Part 393, the vehicle equipment part, confirms nothing fills the gap there either. 393.86 covers the rear impact guard, still commonly called the “ICC bumper” after the old Interstate Commerce Commission (ICC) rule that first required it, purely as a crash-prevention device, underride protection, not an access structure. Nothing in the federal regulatory system requires a ladder, step, or handhold on a trailer.

The comparison to OSHA’s own standards makes the gap concrete. OSHA requires fixed-ladder rungs spaced 10 to 14 inches apart. OSHA requires standard stairs to hold a maximum riser height of 9.5 inches, uniform throughout the run. The climb a driver takes to enter a trailer, ground to the ICC bumper, bumper to the trailer floor, runs roughly 22 to 24 inches per step, the bumper’s own federal ground-clearance specification. That’s 57% to 140% beyond OSHA’s ladder rung maximum, and more than double OSHA’s stair riser maximum. OSHA requires handrails on any stairway with more than 4 risers, and requires fall protection generally at the 4-foot threshold. The trailer floor sits 4 to 4.5 feet up. The ICC bumper has no handrail requirement on either side, at any point. A worker climbing a fixed industrial stair or ladder of the same rise would be standing on a structure illegal to build without a rail. A driver climbing into a trailer is climbing a structure that was never required to have one.

Falls, slips, and trips account for 30% of all nonfatal injuries to tractor-trailer drivers. Their nonfatal injury rate runs 40.2 per 10,000 full-time-equivalent workers against a 5.8 all-occupation average, roughly 7 times higher. An Ontario Workplace Safety and Insurance Board study found that 83% of fall incidents originate at three points: the back of the truck or trailer, the truck step, and the cargo. The rear of the trailer is the single most dangerous access point in the job.

A regulation with “Safety” in its title, still on the books, still cited as if it governs the modern American truck fleet, in fact covers a vehicle configuration the industry itself phased out within a decade of the rule taking effect, and never covered the trailer at all, at any point, under any configuration.

Sources: 49 CFR Part 399, Subpart L, sections 399.203, 399.205, 399.207, verified against eCFR; 49 CFR 393.86; 29 CFR 1910.23; 29 CFR 1910.25 and 1910.28; Surface Transportation Assistance Act of 1982; industry-history sources on cab-over-engine truck market decline (Jalopnik, Curbside Classic, Automotive History); Bureau of Labor Statistics, Workplace Hazards of Truck Drivers, Monthly Labor Review, 2015; Pakes JC, Laing AC, Falls from trucks: a descriptive study based on a workers compensation database, Accident Analysis and Prevention, 2003.

Part VIII: Not in Current Scope

Real, sourced findings from this same body of research that don’t cleanly fit inside the six driver-safety parts. Naming them here, in full, instead of forcing a connection or dropping them silently.

Diesel exhaust and fine particulate matter, beyond carbon monoxide specifically. Diesel exhaust is a mixture of gases and fine particulate matter (PM2.5) produced by combustion. The International Agency for Research on Cancer classified diesel exhaust as a Group 1 known human carcinogen in 2012, the same classification given to asbestos and tobacco. A driver idling at a dock or running the engine overnight for climate control is breathing that exhaust inside a sealed cab for hours at a stretch. This sits outside all six driver-safety parts because none of them address cab air quality as an exposure. Part 392 reaches carbon monoxide specifically, once it’s detected. It says nothing about the particulate matter and other gases in the same exhaust stream. OSHA has no permissible exposure limit for diesel particulate matter in general industry at all. The comparison that makes the gap concrete: the Mine Safety and Health Administration (MSHA), a sister agency inside the same Department of Labor, does regulate this exact substance for underground miners, at 30 CFR Part 57, Subpart D, an 8-hour time-weighted average limit of 160 micrograms of elemental carbon per cubic meter of air. A miner has a federal exposure limit for the substance a truck driver breathes with no limit at all. The Environmental Protection Agency regulates what comes out of the tailpipe into outdoor air. Nobody regulates what stays inside the cab.

Sleeper berth temperature, noise, and light, beyond the hours-of-service off-duty framing already covered in Part VI. The physical specification for the sleeping space itself, not the regulatory meaning of the rest period, lives at 49 CFR 393.76, a vehicle equipment part, not one of the six driver-safety parts this brief counts. That section sets a minimum sleeping surface and requires adequate ventilation, and nothing else. No decibel limit. No temperature range. No lighting standard. OSHA’s own noise standard, 29 CFR 1910.95, sets a permissible exposure limit of 90 decibels A-weighted averaged over 8 hours, with a mandatory hearing conservation program required at an 85-decibel action level, and that standard would apply to a fixed workplace with this noise profile. It doesn’t reach a truck cab, because 393.76 already claims the space and OSHA’s authority is preempted wherever another federal agency has issued a specific rule covering the same hazard. On lighting, OSHA has no dedicated general industry illumination standard at all for a space like a sleeper berth. What exists is Table D-3 under 29 CFR 1926.56, which sets minimum footcandle levels for construction jobsites and construction-related sleeping and eating areas, and doesn’t extend to interstate trucking. Absent a specific standard, OSHA falls back to the General Duty Clause, 29 U.S.C. 654(a)(1), which requires an employer to keep a workplace free of recognized hazards likely to cause serious harm, but nobody enforces that clause against a truck stop parking lot at 2 AM.

Landing gear crank force, design, and injury mechanics. Cranking a trailer’s landing gear up or down is a forceful, repetitive, awkward-posture task performed by nearly every commercial driver’s license holder multiple times a day, and it has never been governed by an ergonomic standard of any kind. FMCSA’s only touch on landing gear at all is a placement rule, 49 CFR 393.60(e)(1)(ii), governing where the gear mounts on the trailer, not the force required to operate it or the posture required to reach it. That leaves the task, if anyone has authority over it, to OSHA. OSHA had a general industry ergonomics standard once. Congress repealed it in 2001 under the Congressional Review Act, and it has never come back. What remains is the same General Duty Clause, 29 U.S.C. 654(a)(1), and OSHA has used it for ergonomic hazards before: Whirlpool Corp. v. Marshall established that repetitive-motion and ergonomic hazards are citable under the General Duty Clause even without a specific standard, and a subsequent Occupational Safety and Health Review Commission (OSHRC) decision involving Pepperidge Farm extended that same logic directly to lifting and repetitive-motion tasks. Nobody has found a record of that authority ever being pointed at landing gear cranking specifically, despite a University of Waterloo ergonomic assessment finding the force required to crank a loaded trailer regularly exceeds published maximum safe push-pull strength values for most of the population.

Heat illness at docks and inside trailers. A driver waiting at a loading dock in summer heat, engine off under an idling restriction, is sitting inside a steel box that can reach 130 to 150 degrees Fahrenheit within minutes. None of the six driver-safety parts address heat exposure. This is squarely OSHA territory in principle, and OSHA has been building toward a rule since August 2024, when it published a Notice of Proposed Rulemaking, docket OSHA-2021-0009, Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings, covering exactly the kind of indoor, non-climate-controlled space a trailer or an idling-restricted cab represents. As of this brief, that rule has not been finalized, and there’s no confirmed date for when it will be. Until it is, the only available hook is the General Duty Clause, and the same multi-employer ambiguity that runs through every hazard in this section applies here too: the carrier doesn’t control the shipper’s dock, and the shipper doesn’t employ the driver standing on it.

Silica dust in highway construction zones. A driver running through an active highway construction zone is moving through respirable crystalline silica generated by the construction work itself, without a respirator, without anyone having assessed that exposure, because he isn’t the construction employer’s worker. OSHA does have a real, specific, binding standard here, just not one that reaches him: 29 CFR 1926.1153 sets a permissible exposure limit of 50 micrograms per cubic meter for respirable crystalline silica in construction settings, with an action level of 25, and requires the construction employer to run exposure assessments, engineering controls, and respirator programs for its own workers. The standard exists. It’s specific and enforceable. It simply runs to the construction employer’s own crew, not to the truck driver passing through the same air. None of the six FMCSA driver-safety parts pick up where that boundary ends.

Ultraviolet exposure and skin cancer. Long-haul drivers show a documented, statistically higher rate of left-side skin cancer, the side of the body exposed to direct sun through the driver’s window for hours at a time, every working day, for a career. There’s no dedicated OSHA standard for occupational solar ultraviolet (UV) exposure in any industry, truck driving included. What exists is the same General Duty Clause and non-binding NIOSH recommendations on sun protection. FMCSA’s own regulation that touches this, 49 CFR 393.60, sets a minimum light transmission requirement for windshields and front side windows, but that rule exists for visibility, not skin protection, and if anything cuts against UV-blocking film by capping how much a window can be tinted.

Vehicle crashworthiness technology mandates. Automatic emergency braking, electronic stability control, event data recorder standardization, autonomous vehicle operation, side underride guards, and speed limiters are real, heavily researched regulatory gaps, and none of them belong in this brief’s six-part count. These are vehicle equipment standards that live under the National Highway Traffic Safety Administration and the Federal Motor Vehicle Safety Standards, a different regulatory framework entirely from the FMCSA driver-safety parts this brief is built around. They’re not an OSHA jurisdiction question at all. OSHA doesn’t reach vehicle crashworthiness in interstate commerce under any circumstance, so there’s no comparison to draw here, only a different agency’s rulemaking record to track separately.

Chain of Responsibility and Safety Management System frameworks, measured against Australia’s 2026 Heavy Vehicle National Law reform. Australia’s law makes shippers, receivers, schedulers, and loading managers legally co-responsible for heavy vehicle safety outcomes, and requires every accredited carrier to run a documented, audited safety management system. Nothing in US federal law reaches that far. The closest analogues are 49 CFR 385, Safety Fitness Procedures, and 49 CFR 390.6, the anti-coercion rule, and neither one is among the six driver-safety parts this brief counts, because both regulate the carrier as an organization and its supply chain relationships, not the driver’s body or fitness directly. This isn’t an OSHA question either. OSHA has no jurisdiction over how a freight broker structures a delivery window.

Broker and shipper liability generally, beyond the specific tie-ins to Montgomery v. Caribe Transport II already used in Parts IV and VI. The Supreme Court’s May 2026 ruling opened state tort liability for brokers who select carriers with documented safety problems, and that ruling connects directly to the medical certification and hours-of-service findings already covered above. The broader liability picture beyond those specific connections runs on state tort law and federal preemption doctrine, not a CFR part, and not an OSHA standard of any kind. It stays out of the section-by-section count for the same reason the Chain of Responsibility comparison does: it’s a legal liability framework layered on top of the regulatory system, not a regulation inside it.

Normalization of deviance outside hours of service. The same mechanism documented inside Part VI, a tolerated violation becoming the unspoken new standard through repetition and silence, runs just as hard through pre-trip inspection shortcuts, deferred maintenance, and cargo securement tolerance. Those three areas sit inside 49 CFR Part 396, Inspection, Repair, and Maintenance, and 49 CFR Part 393, Parts and Accessories Necessary for Safe Operation, neither of which made this brief’s six-part cut because both regulate the vehicle and the carrier’s maintenance program, not the driver’s body or fitness. OSHA’s General Duty Clause could theoretically reach a documented pattern of tolerated safety violations as a recognized workplace hazard, but there’s no record found in this research of that authority ever being used against normalization of deviance specifically inside a trucking operation. It stays a Part 396 and Part 393 problem, tracked elsewhere, not folded into this count.

Sources: International Agency for Research on Cancer Group 1 classification of diesel exhaust, June 2012; 30 CFR Part 57, Subpart D (MSHA diesel particulate matter limits); OSHA Diesel Exhaust/Diesel Particulate Matter hazard information, osha.gov; 49 CFR 393.76; 29 CFR 1910.95; 29 CFR 1926.56, Table D-3; 29 U.S.C. 654(a)(1), General Duty Clause; 49 CFR 393.60(e)(1)(ii); OSHA Ergonomics Program Standard, published November 2000, repealed under the Congressional Review Act, March 2001; Whirlpool Corp. v. Marshall, 445 U.S. 1 (1980); OSHRC, Pepperidge Farm, Inc. decision; University of Waterloo Centre of Research Expertise for the Prevention of Musculoskeletal Disorders, landing gear ergonomic assessment, March 2024; OSHA Notice of Proposed Rulemaking, Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings, docket OSHA-2021-0009, August 2024; 29 CFR 1926.1153; 49 CFR 393.60; Australian Heavy Vehicle National Law 2026 reform materials, National Heavy Vehicle Regulator; 49 CFR Part 385; 49 CFR 390.6; Montgomery v. Caribe Transport II, LLC, No. 24-1238, 608 U.S. ___ (May 14, 2026); 49 CFR Part 396; 49 CFR Part 393.

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