Truck Driver Fatigue: What Is It and How To Prevent It
Truck driver fatigue is a serious threat to public safety. And, it is a disturbingly common cause of fatal truck crashes. Yet it is 100% preventable.
In this blog post, I will discuss what it is, how dangerous it is, how the hours-of-service rules were enacted to combat it and tips for preventing it.
What is truck driver fatigue?
Truck driver fatigue is a dangerous condition that occurs when a commercial driver becomes physically or mentally exhausted from long hours on the road, lack of rest, or disrupted sleep schedules. While it’s not a medical disorder, it significantly impairs a driver’s alertness, judgment and ability to react quickly.
What causes truck driver fatigue?
Truck driver fatigue is a leading factor in serious crashes involving large commercial vehicles. Long hours, tight deadlines, and demanding schedules can push operators beyond safe limits—sometimes even beyond what’s legally allowed. Here are the most common causes of exhaustion in the commercial transport industry:
- Violations of Federal Hours of Service (HOS) Rules – Federal regulations limit how long commercial vehicle operators can drive without taking a break. When these rules are ignored—whether due to employer pressure or poor planning—it significantly increases the risk of fatigue-related crashes.
- Excessive Time on the Road – Even when within legal limits, long shifts behind the wheel can wear down focus and reaction time, especially without adequate rest between runs.
- Poor Sleep and Irregular Schedules – Sleeping in a cab or adjusting to overnight or rotating shifts often leads to low-quality sleep, making it difficult to stay alert during driving hours.
- Pressure to Meet Delivery Deadlines – Operators may skip rest breaks or push through exhaustion to stay on schedule, especially when their pay is tied to delivery time or mileage.
- Monotonous Driving Conditions – Endless highway miles with little variation can cause mental fatigue and even lead to “highway hypnosis,” where drivers zone out or fall asleep at the wheel.
- Health and Lifestyle Factors – Poor diet, dehydration, and untreated medical conditions like sleep apnea can all contribute to chronic tiredness behind the wheel.
- Use of Medications or Stimulants – Certain medications or excessive use of caffeine can disrupt sleep patterns or cause drowsiness, further increasing the risk of fatigue-related accidents.
What are the consequences of truck driver fatigue?
Truck driver fatigue among commercial vehicle operators is a serious safety concern. When a driver is overly tired or sleep-deprived, their ability to operate a large vehicle safely is significantly reduced. Here are some of the most serious consequences:
- Impaired Judgment and Slower Reaction Times – Tired drivers often struggle to make quick, accurate decisions. Their ability to react to sudden traffic changes, obstacles, or emergencies becomes compromised.
- Increased Likelihood of Serious Crashes – Fatigue can lead to “microsleeps”—brief moments of unconsciousness lasting a few seconds. At highway speeds, this can result in devastating collisions.
- Reduced Focus and Awareness – When a driver is mentally or physically exhausted, staying alert and aware of road conditions, signage, and other vehicles becomes difficult, increasing the chance of mistakes.
- Violation of Federal Safety Standards – Operating a commercial vehicle while fatigued may also involve violating federal Hours of Service regulations, exposing both the driver and their employer to legal consequences.
When truck driver fatigue leads to an accident, the consequences can be devastating. That’s why federal rules are in place to limit driving hours and protect everyone on the road. Unfortunately, fatigue remains one of the leading causes of serious commercial vehicle crashes.
The Federal Motor Carrier Safety Administration (FMCSA), the federal agency responsible for policing and regulating commercial vehicle operators and transportation companies to ensure they operate safely on the nation’s roadways, describes this condition as the “result of physical or mental exertion that impairs performance.”
Don’t ignore the warning signs
Truck driver fatigue doesn’t always show up all at once—often, it builds gradually and becomes dangerous before the operator realizes it. Recognizing the early warning signs of exhaustion in a commercial vehicle operator can help prevent serious accidents. Common red flags include:
- Yawning or Frequent Eye Blinking – Repeated yawning or struggling to keep eyes open are early signs the body is fighting sleep.
- Drifting Between Lanes – Difficulty maintaining lane position or swerving may signal lapses in focus or microsleeps.
- Delayed Reactions – Slower braking, late responses to traffic signals, or hesitation at intersections indicate impaired alertness.
- Zoning Out or Memory Lapses – Forgetting the last few miles driven or missing exits can point to mental exhaustion or “highway hypnosis.”
- Head Nodding or Jerking Awake – Sudden head movements suggest the driver may be briefly dozing off at the wheel.
- Difficulty Maintaining Speed – Inconsistent speeds or erratic acceleration/deceleration often reflect impaired concentration.
- Irritability or Poor Decision-Making – Tiredness can lead to frustration, riskier maneuvers, and lapses in judgment on the road.
How to combat exhaustion
How dangerous is truck driver fatigue?
Studies have found it to be a more potent driving impairment than the influence of drugs or alcohol — yet a wide number of big rig drivers bend the rules to maximize their time behind the wheel.
The FMCSA reports that “[r]esearch has indicated that being awake for 18 hours is comparable to having a blood alcohol concentration (BAC) of 0.08 percent, which is legally intoxicated and leaves you at equal risk for a crash.”
Similarly, the National Sleep Foundation reports:
“Studies have shown that sleeping only 4-5 hours in a 24 hour period increases a driver’s crash risk as much as a blood alcohol concentration of 0.05, and getting less than 4 hours of sleep increases crash risk as much as a BAC of roughly 0.12.”
A serious threat to public safety
The U.S. Transportation Secretary has observed that nearly 4,000 people die in large truck crashes each year and “[d]river fatigue is a leading factor in large truck crashes.”
The Federal Motor Carrier Safety Administration (FMCSA)’s “Large Truck and Bus Crash Facts” study found that fatigue was a “driver impairment-related factor” in fatal large truck crashes between 2019 and 2021 with the following frequency:
- Was a factor for 72 of 4,977 operators of large trucks involved in fatal crashes in 2019
- Was a factor for 68 of 4,754 operators of large trucks involved in fatal crashes in 2020
- Was a factor for 63 of 5,633 operators of large trucks involved in fatal crashes in 2021
(Source: FMCSA, Large Truck and Bus Crash Facts 2021, published November 2023, People, “Table 31. Drivers of Large Trucks in Fatal Crashes by Distraction-Related and Impairment-Related Factors, 2019-2021”)
Addressing and preventing truck driver fatigue
In an effort to address and prevent truck driver fatigue, the Federal Motor Carrier Safety Administration (FMCSA) created hours-of-service rules which regulate the amount of time each workday that truck drivers can spend driving and/or otherwise performing tasks that qualify as being “on-duty.”
For example, under 49 CFR § 395.3(b), drivers are limited to 60 hours of compensated work in a seven-day period or 70 hours in an eight-day period.
In explaining the need for hours-of-service rules, the U.S. Transportation Secretary explained that one of the significant challenges with combating truck driver fatigue is that in addition to impairing truckers’ ability to drive, exhaustion impairs their ability to assess and evaluate their own tiredness levels:
“That fatigue leads drivers to have slower reaction times and a reduced ability to assess situations quickly. One of the most dangerous elements of fatigue is how quickly it can sneak up on vehicle operators, be they car drivers or truck drivers. The research revealed that truck drivers (like most people) often can’t assess their own fatigue levels accurately and are therefore unaware that their performance has degraded. Too often, fatigued drivers fail to notice that they are drifting between lanes.”
For the big rig operatators, breaking the hours-of-service rules and regulations can mean the difference between putting food on the table, or being next in the unemployment line.
Tips to combat exhaustion among commercial vehicle operators
Combatting and preventing truck driver fatigue requires a combination of personal responsibility, regulatory compliance, and industry support. Here are effective ways to reduce the risk:
- Follow Federal Hours of Service (HOS) Rules – Adhering to HOS regulations ensures drivers take required breaks and do not exceed safe driving limits. Violating these rules increases crash risk and legal liability.
- Get Consistent, Quality Sleep – Resting in a quiet, dark environment and aiming for 7–9 hours of uninterrupted sleep helps maintain alertness during long shifts.
- Take Scheduled Breaks – Regular stops for stretching, fresh air, and short rest periods can restore focus and reduce physical strain during long hauls.
- Avoid Stimulant Dependency – While caffeine may help temporarily, relying on energy drinks or excessive coffee can disrupt sleep patterns and lead to sudden crashes in alertness.
- Maintain a Healthy Lifestyle – A balanced diet, regular hydration, and exercise—even light stretching—can improve long-term energy levels and reduce truck driver fatigue-related health issues.
- Recognize and Respond to Warning Signs – Drivers should be trained to recognize early symptoms like drifting lanes, heavy eyelids, or memory lapses—and pull over before it becomes dangerous.
- Plan Routes and Schedules Wisely – Avoiding unrealistic delivery deadlines and planning rest stops into long routes allows drivers to stay within legal limits and rest as needed.
Helping lawyers better understand hours-of-service regulations
This is a hot topic right now for the commercial transportation industry and lawyers, and for a very good reason.
A tired commercial vehicle driver is as impaired as an intoxicated driver and exhaustion is one of the most common causes of semi crashes, both in Michigan and across the country.
As stated above, preventing fatigue starts and ends with transportation companies and truck drivers following the hours-of-service rules established by the Federal Motor Carrier Safety Administration (FMCSA).
Found at 49 CFR § 395.3 and 49 CFR § 395.8, they are some of the most important federal regulations for lawyers to remember in any commercial vehicle crash case.
Knowledge of hours-of-service regulations, coupled with a careful study of a commercial vehicle operator’s record of duty status as reflected in the data from his or her “electronic logging device” (which replaced written log books in December 2017) can reveal exhaustion.
Truck driver fatigue accident lawyer tip: driving doesn’t necessarily mean working
Drivers are limited to a total of 14 hours of work in a single “on-duty” period. (49 CFR § 395.3(a)(2)) This type of non-driving activity could include all time:
- Waiting to be dispatched at a terminal
- Doing a CDL pre-trip inspection
- Loading and unloading
- Repairing the commercial vehicle
- Waiting for the commercial vehicle to be repaired
- Submitting to a DOT roadside inspection
Virtually any work performed on behalf of a motor carrier should be added to a driver’s 14-hour daily work limit.
However, even work performed for another company or organization will count toward a driver’s on-duty period – even if it’s completely unrelated to the commercial transportation industry.
Under 49 CFR § 395.2(9), “on- duty” time means performing “any compensated work for a person who is not a motor carrier.”
This is confirmed by the official interpretation of 49 CFR § 395.2 which appears on the FMCSA’s website:
- Question 11: “Must non-transportation-related work for a motor carrier be recorded as on-duty time?”
- Guidance: “Yes. All work for a motor carrier, whether compensated or not, must be recorded as on-duty time. The term “work” as used in the definition of “on-duty time” in 49 CFR 395.2 of the Federal Motor Carrier Safety Regulations (FMCSRs) is not limited to driving or other non-transportation-related employment.”
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