A Perspective from Roadside by Jake Elovirta, Director of Enforcement Programs, Commercial Vehicle Safety Alliance (CVSA)
Introduction
Commercial Motor Vehicle (CMV) enforcement agencies operate on a straightforward premise that a fully loaded tractor-trailer weighing up to 80,000 lbs. shares the same roadways as passenger cars, motorcycles, and school buses. The margin for error when something goes wrong is virtually nonexistent. Enforcement exists to ensure that margin is never tested unnecessarily.
Every day, enforcement officers conduct roadside inspections, traffic enforcement stops, size and weight checks, and compliance reviews under the authority of federal and state regulations administered through the Federal Motor Carrier Safety Administration (FMCSA). The goal is not to burden commerce; it is to prevent the kind of serious or fatal crashes that too often occur due to ignored maintenance, falsified records, or impaired operators. This article presents the enforcement community’s perspective on why that mission is so essential, and why prosecution of serious violations is the necessary partner to the work done by roadside enforcement.
The Regulatory Framework That Guides Enforcement
CMV enforcement in the United States operates within a well-established federal framework. The Federal Motor Carrier Safety Regulations (FMCSRs), codified under 49 C.F.R. Parts 300–399, govern virtually every aspect of commercial motor vehicle operations from driver qualifications and hours of service to vehicle maintenance and hazardous materials transport. The FMCSA was officially established under the Motor Carrier Safety Improvement Act of 1999 (Pub. L. 106–159), which holds primary federal authority for CMV safety oversight.
At the state level, enforcement agencies have adopted the federal regulations under compatible state regulations and participate as members of the Commercial Vehicle Safety Alliance (CVSA), which standardized inspection procedures and out-of-service criteria across jurisdictions. This coordination ensures that a vehicle placed out of service in one state cannot simply cross a state line to continue operating illegally. For enforcement officers, this framework is not bureaucratic red tape; it is the legal architecture that gives their work meaning and consequence.
What CMV Enforcement Officers Actually Do
CMV enforcement is not simply issuing citations at weigh stations. Officers are trained to identify safety violations at roadside that can turn an 80,000-pound vehicle into a hazard to the motoring public.
Roadside Inspections
Officers are trained to identify safety violations at roadside that can turn an 80,000 pound vehicle into a hazard to the motoring public. Roadside inspections follow CVSA’s standardized protocols and can range from a Level I inspection—with a comprehensive 37-step examination of both driver and vehicle—to more targeted checks based on observed behavior or data-driven risk scoring.
Under 49 C.F.R. Part 396, carriers are required to maintain vehicles in safe operating condition, and inspections verify that those obligations are being met. Officers routinely find brake systems exceeding the adjustment limits set in 49 C.F.R. Part 393, defective tires, inoperable lighting, and compromised coupling devices. These are not minor inconveniences; brake defects alone can extend stopping distances significantly, with potentially fatal consequences at highway speeds.
When a violation meets an out-of-service threshold as defined by CVSA Out-of-Service (OOS) Criteria, officers have the authority to remove the driver or vehicle from operation immediately. During CVSA’s 2025 International Roadcheck event, vehicles inspected had an OOS rate of 18.1%,1 meaning that nearly one in every five trucks inspected was placed out of service for critical violations. Each of those removals represents a potential crash that did not occur.
Hours-of-Service and Electronic Logging Device
Enforcement (ELD) Driver fatigue is among the most well-documented contributors to CMV crashes. Research from FMCSA has found that fatigue is a factor in a significant percentage of large-truck crashes. 2,3 Hours-of-service (HOS) regulations under 49 C.F.R. Part 395 set strict limits on driving time and mandatory rest requirements precisely because the consequences of fatigued commercial driving are so severe.
Since the ELD mandate took full effect under 49 C.F.R. § 395.8(a)(1), enforcement officers have a more reliable tool for verifying compliance. But ELD data is only useful if violations are acted upon. When officers discover falsified supporting documents, manipulated ELD data, or drivers operating far beyond legal hours, those findings deserve prosecutorial attention proportionate to the danger involved. A driver who has been behind the wheel for 20 hours is not a minor regulatory offender; that driver presents a risk comparable to an impaired operator.4
Drug and Alcohol Enforcement
Commercial drivers are subject to a 0.04% blood alcohol concentration (BAC) limit under 49 C.F.R. § 392.5, half the standard 0.08% limit applicable to non commercial drivers. This stricter standard reflects the obvious reality that the consequences of impaired operation scale with vehicle size.5 The FMCSA’s drug and alcohol testing program, governed by 49 C.F.R. Part 382, requires pre-employment, random, post-accident, and reasonable suspicion testing.
Officers trained in impaired driving detection encounter commercial drivers who are operating under the influence of alcohol, controlled substances, or prescription medications that impair their ability to safely control a large vehicle. Prosecution of cases sends a message that the commercial transportation industry demands, and the public deserves.
Hazardous Materials Compliance
The transportation of hazardous materials is regulated under the Hazardous Materials Regulations (HMR) at 49 C.F.R. Parts 100–185, administered jointly by the Pipeline and Hazardous Materials Safety Administration (PHMSA) and FMCSA. Officers enforcing these regulations are not checking paperwork as a mere formality. They are verifying that explosives, flammable liquids, toxic substances, and radioactive materials are properly packaged, labeled, placarded, and routed because the consequence of failure can be a community-level disaster.
Hazardous materials violations are among the most serious that enforcement officers encounter. A single incident involving improperly secured or documented hazardous cargo can result in mass casualties, environmental contamination requiring years of remediation, and the displacement of entire neighborhoods. 6 These violations warrant aggressive prosecution.
1 CVSA 2025 International Roadcheck Results Press Release, CVSA Releases 2025 International Roadcheck Results, CVSA–Commercial Vehicle Safety Alliance. B
2 Federal Motor Carrier Safety Administration. (2006). Large Truck Crash Causation Study. U.S. Department of Transportation.
3 National Academies of Sciences, Engineering, and Medicine. (2016). Commercial Motor Vehicle Driver Fatigue, Long-Term Health, and Highway Safety: Research Needs. National Academies Press.
4 Dawson, D., & Reid, K. (1997). Fatigue, alcohol and performance impairment. Nature, 388(6639), 235.
5 A Review of Alcohol-Impaired Driving: The Role of Blood Alcohol Concentration and Complexity of the Driving Task, Journal of Forensic Sciences, Vol. 58, No. 5 (Sept. 2013). Summary: A review of the scientific literature indicates that a blood alcohol concentration (BAC) of 0.05% impairs the faculties necessary for safe motor vehicle operation.
6 National Transportation Safety Board. (2025). Cargo Tank Combination Vehicle Roadway Departure, Rollover, and Release of Anhydrous Ammonia, Teutopolis, Illinois [Final report]
