Common Dot Violations: A Complete Guide

June 11, 2025

Share this article:

What Are DOT Violations and Why They Matter

DOT violations are breaches of regulations set by the Department of Transportation (DOT) and the Federal Motor Carrier Safety Administration (FMCSA). These rules govern the safe operation of commercial motor vehicles and cover everything from driver behavior to vehicle maintenance.



Violations can occur during roadside inspections, audits, or accident investigations. Some may seem minor, but even small infractions can have serious consequences. Repeated or severe violations can lead to fines, increased insurance costs, loss of operating authority, and damage to a company’s reputation.


Understanding DOT violations is critical for fleet operators and drivers. Staying compliant helps protect the safety of the roadways and shields businesses from costly penalties and operational disruptions.

Top 10 Most Common DOT Violations

Some DOT violations appear more frequently during inspections and audits. Focusing on these areas helps fleet managers and drivers reduce risk and stay compliant.


Each violation not only leads to fines but also damages a company’s safety record and increases liability.

01. Brake system issues

Faulty or poorly maintained brakes are a major safety concern.

02. Tire Problems

Worn, underinflated, or damaged tires can result in out-of-service orders.

03. Lighting defects

Broken headlights, taillights, or turn signals are common failures.

04. Hours of Service (HOS) violations

Exceeding driving limits or inaccurate logs lead to fines.

05. Driver’s license violations

Expired, suspended, or improper licenses disqualify drivers.

06. Load securement failures

Unsecured cargo increases accident risks and inspection failures.

07. Missing driver qualification files

Incomplete records trigger penalties during audits.

08. Medical certificate lapses

Drivers must carry a valid Medical Examiner’s Certificate (MEC).

09. ELD non-compliance

Improper use of Electronic Logging Devices results in citations.

10. Insurance issues

Lapsed or insufficient insurance coverage is a major violation.

Driver-Related Violations: Fatigue, Licensing, and More

Many DOT violations are directly tied to driver behavior and compliance. Fatigue, improper licensing, and medical issues are among the most common causes.


Fatigue violations happen when drivers exceed their permitted Hours of Service (HOS). Driving beyond legal limits leads to dangerous conditions on the road and heavy penalties. Proper scheduling and real-time monitoring can help reduce fatigue-related risks.


Licensing violations occur when drivers operate without a valid or proper Commercial Driver’s License (CDL). Whether it is an expired license or a missing endorsement, these violations put drivers and companies at risk of fines and disqualification.


Medical violations result from expired or missing Medical Examiner’s Certificates (MECs). Drivers must undergo periodic medical evaluations to confirm they are fit to operate commercial vehicles safely.


Paying close attention to driver qualifications, health, and hours can prevent many of the most damaging DOT violations.

Vehicle Maintenance Violations to Watch For

Poor vehicle maintenance is a leading cause of DOT violations. Commercial vehicles must meet strict safety standards, and failure to perform regular inspections and repairs can quickly lead to citations.


Routine inspections and preventive maintenance programs help catch these issues before they become violations. Addressing maintenance needs promptly not only keeps vehicles compliant but also extends their lifespan and improves road safety.

Common maintenance-related violations include:

  • Brake system defects: Worn or improperly adjusted brakes are one of the most frequent and serious issues.
  • Tire violations: Bald or damaged tires increase the risk of blowouts and accidents.
  • Lighting failures: Broken or non-functioning lights reduce vehicle visibility and signal effectiveness.
  • Steering system problems: Faulty steering components compromise control and safety.
  • Leaking fluids: Oil, coolant, or fuel leaks can result in environmental hazards and fines.

Hours of Service (HOS) and ELD Compliance Pitfalls

Hours of Service (HOS) regulations are designed to prevent driver fatigue, but they remain one of the most common areas for DOT violations. Staying compliant requires more than following time limits; it also involves accurate recordkeeping.


Electronic Logging Devices (ELDs) are required to track HOS, but many violations happen when drivers misuse devices or fail to keep them properly updated.


Common pitfalls include:

Logging inaccurate start and stop times

Failing to maintain backup copies of ELD data

Using non-compliant ELD systems

Skipping required edits and annotations for logbook corrections

HOS and ELD violations are costly and can raise concerns during audits and inspections. Consistent training and regular reviews of ELD data help prevent compliance issues.

How DOT Violations Impact Your CSA Score and Business

DOT violations do more than result in fines. They directly affect a carrier’s CSA (Compliance, Safety, Accountability) score, a critical metric that reflects the overall safety and reliability of a fleet.


The FMCSA uses CSA scores to prioritize carriers for inspections and interventions. A high number of violations can lower your score, making your company a target for audits and investigations. Poor scores can also drive up insurance premiums and make it harder to secure contracts with shippers who monitor safety ratings.



Beyond regulatory consequences, repeated violations damage your company’s reputation. Clients and partners often view a strong safety record as a sign of reliability and professionalism. Keeping DOT violations in check protects your CSA score and supports long-term business success.

Tips to Prevent DOT Violations and Stay Compliant

Preventing DOT violations starts with building a culture of safety and compliance. Regular training, thorough inspections, and proactive recordkeeping help fleets avoid common pitfalls.


Focus on key areas such as maintaining up-to-date Driver Qualification Files, scheduling routine vehicle maintenance, monitoring Hours of Service through compliant ELDs, and conducting internal audits. Addressing small issues early prevents them from becoming costly violations later.


Investing in compliance management tools can make a significant difference. Automation helps track deadlines, manage documents, and identify risks before they lead to penalties.



National Fleet Services offers expert compliance support and DOT-focused solutions designed to keep your fleet audit-ready. Contact us today to learn how we can help you reduce risk, avoid violations, and protect your business.

Connect with us:

fleet insights

By Matthew Bowles January 27, 2026
On January 8, 2026, the U.S. Department of Transportation (DOT) announced that the minimum random drug and alcohol testing rates for CDL drivers will remain unchanged. For calendar year 2026, the required testing rates are: 50% for random drug testing 10% for random alcohol testing This marks the sixth consecutive year that these rates have remained in effect following the Federal Motor Carrier Safety Administration’s (FMCSA) increase from 25% to 50% in January 2020. Based on current industry data, these testing levels are unlikely to decrease in the near future. Why the Testing Rate Remains at 50% FMCSA operates under a performance-based testing model established by its 2001 final rule, Controlled Substances and Alcohol Use and Testing. Under this rule: When the industry-wide positive random drug test rate reaches or exceeds 1.0% , FMCSA is required to maintain a 50% random testing rate . To reduce the rate back to 25% , the industry must demonstrate positive test rates below 1.0% for two consecutive calendar years . At present, the data does not support a reduction. The last decrease occurred in 2016 when positive test rates were low enough to justify a reduction to 25%. However, by 2018 the positive rate had climbed back to 1.0%, triggering the return to 50% testing beginning in 2020. What the Drug & Alcohol Clearinghouse Data Shows The FMCSA Drug & Alcohol Clearinghouse provides clear insight into why the testing rate has not changed. Since January 2020: Over 300,000 drug and alcohol violations have been reported 324,996 drivers have at least one violation on record More than 200,000 drivers are currently in prohibited status Over 150,000 prohibited drivers have not started the return-to-duty (RTD) process That last figure is particularly significant. More than 150,000 CDL holders remain sidelined and legally prohibited from operating a commercial motor vehicle, with no steps taken to regain eligibility. Substances Most Frequently Identified The Clearinghouse also tracks violations by substance. Since 2020, cumulative positive results show: Marijuana (Δ9-THCA): 171,270 Cocaine: 47,237 Methamphetamine: 24,589 Amphetamine: 22,932 Opioids (combined): 21,763 Other substances: 5,793 Marijuana alone accounts for approximately 60% of all positive drug tests . While marijuana may be legal at the state level in many areas, federal law strictly prohibits its use by CDL drivers . State legalization does not override DOT regulations. What This Means for Motor Carriers The Minimum Is a Floor, Not a Ceiling The 50% testing rate is the minimum requirement , not a maximum. FMCSA allows and encourages carriers to test at higher rates if their company policies support it, provided all DOT testing procedures are followed. Many fleets choose to operate testing pools at 75% or even 100% . A strong testing program can: Act as a powerful deterrent Identify issues before they lead to incidents or crashes Demonstrate a commitment to safety for insurers and shippers Reduce liability exposure Any testing conducted above the DOT minimum must still follow proper DOT protocols, and non-DOT testing programs must be kept completely separate from DOT testing pools. Understanding the Numbers For example, a carrier with 100 drivers in its random pool must conduct at least: 50 random drug tests 10 random alcohol tests Additional requirements include: Tests must be reasonably spread throughout the year Driver selections must be truly random using a scientifically valid method Every driver must have an equal chance of selection Owner-operators must be enrolled in a consortium Clearinghouse Compliance Is Mandatory With Clearinghouse II fully implemented as of November 2024 , enforcement has expanded significantly. State DMVs now have real-time access to Clearinghouse data, meaning violations can directly impact a driver’s CDL status. Motor carriers must ensure: A full pre-employment Clearinghouse query is completed before a driver operates a CMV Annual queries are conducted on all current drivers Drivers in prohibited status are immediately removed from safety-sensitive functions All Clearinghouse actions are properly documented What Drivers Need to Know For CDL drivers, the message is clear: Federal law applies regardless of state marijuana laws. A positive THC test will result in immediate prohibition until the return-to-duty process is completed. Violations follow you. Drivers can no longer avoid failed tests by changing employers. All carriers are required to query the Clearinghouse. Refusals are treated as positive tests. Missing a test, tampering with a sample, or failing to provide a sufficient specimen without valid medical justification all count as refusals. The return-to-duty process is costly and time-consuming. Drivers should expect SAP evaluations, treatment, RTD testing, and follow-up testing for at least 12 months—often costing $2,000 to $5,000 or more . Looking Ahead The 50% random drug testing rate will remain in place until the industry achieves two consecutive years with positive rates below 1.0% . Given current Clearinghouse trends—particularly marijuana-related violations—it is reasonable to expect this testing rate to continue through at least 2028, and likely beyond . Smart fleet operators will treat this as standard operating procedure and focus on what they can control: strong hiring practices, consistent Clearinghouse queries, compliant random selection processes, and a culture that prioritizes safety and accountability.  For drivers, the takeaway is simple: know the rules, stay compliant, and don’t gamble your career on the belief that you won’t be selected .
Truck driver in a plaid shirt and vest, using a tablet, standing in front of a blue truck.
January 26, 2026
Understand DOT numbers, who needs them, and how to apply through FMCSA to stay compliant and avoid costly delays.
By Matthew Bowles January 14, 2026
Introduction: Trucking Cost Pressures Intensify in 2026 The U.S. trucking industry enters 2026 facing sustained margin pressure. Rising operating costs, regulatory complexity, and uncertain freight demand force carriers to rethink traditional cost-cutting strategies. Fleets can no longer rely on rate increases or short-term expense reductions to protect profitability. Instead, strategic cost cutting and outsourcing services have become essential tools for long-term success. Forward-thinking carriers now focus on operational efficiency, cost visibility, and expert-managed services . Outsourcing non-core but critical functions allows fleets to control expenses while maintaining compliance and performance. As a result, companies that adopt professional fleet outsourcing solutions gain a competitive advantage in 2026 and beyond. Key Trucking Costs Driving Cost-Cutting Strategies in 2026 Rising Driver and Labor Costs Driver wages, benefits, and recruiting expenses remain elevated. Competition for qualified drivers continues to increase fixed operating costs per mile. Even as freight cycles fluctuate, labor costs remain difficult to reduce without impacting service quality. Fleet Maintenance and Repair Expenses Maintenance costs per truck continue to rise due to: Higher parts prices Longer repair times Aging equipment fleets Increased technology complexity Reactive maintenance strategies lead to unnecessary downtime and inflated repair invoices. Fleets that lack centralized maintenance oversight often overspend without realizing it. Compliance and Fuel Tax Reporting Costs Regulatory requirements related to IFTA fuel tax reporting, DOT compliance, vehicle registrations, and audits continue to expand. Many fleets underestimate the internal cost of managing compliance, including staff time, software, and audit exposure. Insurance, Risk, and Claims Exposure Insurance premiums remain high, particularly for fleets with poor documentation or inconsistent compliance practices. Inadequate maintenance records and reporting gaps increase risk and long-term insurance costs. Why Outsourcing Services Are a Core Trucking Strategy in 2026 Outsourcing Reduces Fixed Overhead Outsourcing converts fixed internal costs into scalable, variable expenses. Instead of hiring and training specialized staff, fleets access experienced professionals when they need them. Focus on Core Trucking Operations Successful carriers focus on freight, drivers, safety, and customer relationships. Outsourcing administrative and technical functions allows leadership to prioritize revenue-generating activities. Access to Industry Expertise and Data Professional outsourcing partners invest in systems, analytics, and regulatory expertise that individual fleets struggle to maintain internally. This expertise leads to better decision-making and lower total cost of ownership . Top Trucking Functions Outsourced for Cost Cutting in 2026 Fleet Maintenance Management and Cost Control Maintenance represents one of the largest controllable expenses in trucking. Outsourcing maintenance management helps fleets: Validate repair invoices Control vendor pricing Reduce unnecessary repairs Improve preventive maintenance scheduling Data-driven maintenance oversight lowers cost per mile and increases vehicle uptime. Fuel Tax Compliance and IFTA Reporting Fuel tax reporting remains complex and audit-sensitive. Outsourcing IFTA reporting and fuel tax compliance services improves accuracy, reduces penalties, and protects cash flow. Fleets also reduce internal administrative workload. Back-Office and Administrative Services Accounting support, settlements, invoicing, and cost reconciliation consume significant internal resources. Outsourced back-office services improve accuracy, speed reporting, and reduce staffing pressure. Vendor Management and Cost Auditing Outsourcing vendor oversight introduces discipline and transparency. Fleets gain insight into pricing trends, service quality, and cost anomalies across maintenance, fuel, and compliance vendors. National Fleet Services: A Leader in Trucking Cost-Cutting and Outsourcing Services As fleets adopt outsourcing strategies in 2026, National Fleet Services (NationalFleetServicesLLC.com) plays a critical role in helping carriers control costs and improve operational efficiency. National Fleet Services focuses on fleet maintenance management, compliance support, and cost visibility , delivering solutions tailored to each fleet’s size and operating model. Fleet Maintenance Cost Management National Fleet Services applies structured processes to maintenance oversight, repair validation, and vendor management. Their services help fleets: Reduce inflated repair bills Improve maintenance planning Identify high-cost vehicles Increase asset utilization By leveraging data across multiple fleets, National Fleet Services delivers insights that individual carriers often cannot generate internally. Fuel Tax and Compliance Support Fuel tax compliance remains one of the highest-risk administrative functions in trucking. National Fleet Services supports accurate fuel tax reporting, audit readiness, and documentation management. This reduces penalties, minimizes internal labor demands, and improves regulatory confidence. Back-Office Efficiency and Cost Visibility National Fleet Services improves data accuracy and reporting consistency, helping fleets understand true operating costs. Leadership gains clearer insight into cost drivers, trends, and opportunities for improvement. Data-Driven Trucking Cost Reduction in 2026 In 2026, data-driven cost management separates profitable fleets from struggling ones. Fleets need reliable data to: Track cost per mile Benchmark vendor pricing Optimize maintenance intervals Forecast expenses Outsourcing partners like National Fleet Services invest heavily in analytics and reporting tools, giving fleets enterprise-level insights without enterprise-level overhead. Cost Cutting Without Sacrificing Fleet Performance Traditional cost cutting often damages long-term performance. Deferred maintenance, understaffed compliance teams, and fragmented systems increase risk and future expenses. Strategic outsourcing avoids these pitfalls by maintaining professional standards while reducing total costs. National Fleet Services helps fleets preserve operational discipline while lowering expenses—protecting uptime, safety, and compliance. Scalability and Flexibility Through Outsourcing Freight markets remain volatile in 2026. Fleets expand, contract, acquire, or reorganize more frequently. Outsourcing provides scalability without disruption. National Fleet Services supports fleets through growth cycles, downsizing, and consolidation—allowing costs to scale with operations rather than lag behind them. Risk Reduction and Long-Term Cost Control Risk management directly impacts operating costs. Compliance failures, audit findings, and poor maintenance records increase fines, legal exposure, and insurance premiums. Outsourcing introduces professional oversight and process consistency. National Fleet Services helps fleets reduce operational risk while improving documentation and audit readiness. Lower risk leads to lower long-term operating costs . Competitive Advantage in the 2026 Trucking Market In today’s trucking environment, fleets compete on more than rates. They compete on: Cost discipline Operational intelligence Compliance accuracy Data visibility Fleets that partner with National Fleet Services gain a sustainable advantage through lower costs, improved performance, and better decision-making. Conclusion: Outsourcing Is No Longer Optional for Trucking Fleets The trucking industry will not return to simpler cost structures. Regulation, technology, and market volatility ensure continued complexity. In 2026, successful cost cutting requires precision, expertise, and data—not blunt reductions. Outsourcing trucking services delivers that precision when fleets choose the right partners. National Fleet Services exemplifies this approach by helping carriers reduce costs, improve compliance, and operate more efficiently—without sacrificing control or performance.  For trucking companies navigating 2026, strategic outsourcing is not just a cost-cutting tactic. It is a competitive necessity.