If you feel too tired to drive safely, do not start or continue the trip. If you are already on the road, pull over somewhere safe, then tell your supervisor or safety contact you cannot safely drive and ask for rest or another way to travel. Fatigue can make driving unsafe even when you have not exceeded a specific hours limit.
What to do right now
- If you have not started driving: Tell your supervisor you do not believe you can drive safely. Do not get behind the wheel while you feel impaired by fatigue.
- If you are already driving: Pull over at a safe location as soon as you can. Do not try to finish the route first. Contact your supervisor or workplace safety contact once stopped.
- Ask for a specific safe alternative: Request rest, reassignment, another driver, or safe transport. Do not resume driving unless you are fit to do so.
- Use a temporary countermeasure only as a temporary measure: NIOSH describes caffeine and a 15-to-30-minute nap as possible short-term countermeasures. They are not permission to drive while you still feel unsafe; sleep is the only cure for fatigue. NIOSH driver-fatigue guidance
A suggested message to your supervisor
“I’m too fatigued to drive safely. I need to stop and arrange rest or another safe way to travel. Please confirm the plan.”
This is practical wording, not a legally required formula. If speaking is difficult, send the message through a workplace channel you can use safely after stopping.
Why fatigue is a driving hazard
Fatigue can slow reaction time and impair attention and judgment. It can also cause lane drifting or microsleeps, in which a person briefly falls asleep without intending to. Long wakefulness, repeated insufficient sleep, night or shift work, monotonous tasks, sleep disorders, stress, and medications that cause drowsiness can all contribute. NIOSH sums up the risk this way: “Whatever the source – lack of or poor-quality sleep, long hours of work or driving, shift work, stress, or sleep disorders – fatigue affects your ability to drive safely.” National Institute for Occupational Safety and Health (NIOSH), Driver Fatigue on the Job
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NIOSH reports that as many as one in five fatal crashes in the general population involve driver fatigue. It also says most adults need 7 to 9 hours of sleep each day. These are population-level figures, not a way to determine whether a particular person is safe to drive.
OSHA’s drowsy-driving guidance, attributing the estimates to NIOSH, says impairment after 17 consecutive hours awake is estimated to be equivalent to a blood alcohol content (BAC) of .05, and after 24 hours awake to a BAC of .10. These are impairment comparisons, not legal intoxication thresholds or a personal safety test. OSHA, Drowsy Driving
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Report the pressure and keep a record
After reaching safety, report the fatigue to your supervisor or designated safety contact and use any workplace incident or hazard-reporting process. NIOSH advises workers who feel fatigued while driving to pull over, report the fatigue, and determine a safe course of action.
Keep a factual record of what happened. Note the date and time, your work and driving hours, the schedule you were given, the fatigue symptoms you experienced, whom you contacted, what you requested, the instructions you received, and any near miss or incident. Save relevant messages or schedule records. Documentation is a practical step, not a universal legal requirement, and reporting channels vary by employer.
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What employers should do to prevent fatigue-related driving
Fatigue risk cannot be managed only by asking individual workers to push through or rely on personal judgment. OSHA recommends assessing motor-vehicle risks, having written safety procedures, reviewing operational practices, and setting workloads and schedules that allow safe driving and compliance with applicable hours-of-service rules. OSHA states: “Employers should ensure that workloads and work schedules allow employees to drive at a safe speed and obey any applicable hours-of-service regulations.” OSHA, Motor Vehicle Safety – Employers
OSHA’s fatigue-prevention guidance also points to staffing review, rest opportunities, worker education, and fatigue risk management. OSHA, Preventing Worker Fatigue A schedule that creates a foreseeable fatigue risk calls for workplace controls, not just an expectation that a driver will compensate for it.
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Can your employer make you drive, or can you refuse?
There is no single answer that applies to every worker or every work trip. The applicable rules and protections depend on factors such as whether you are operating a regulated commercial motor vehicle, your job, and your jurisdiction. A person can be dangerously fatigued without having exceeded a particular hours-of-service limit; conversely, hours-of-service rules apply only to covered drivers and situations.
OSHA says the Surface Transportation Assistance Act protects drivers against certain retaliation for safety complaints involving commercial motor vehicle rules and for refusing to operate an unsafe vehicle. That statement does not establish a blanket protected right for every worker to refuse any work-related drive because of fatigue. Coverage, deadlines, and remedies are case-specific. For guidance, contact OSHA or the relevant state labor or workplace-safety agency; a union representative or qualified attorney can help assess your circumstances. OSHA, Motor Vehicle Safety – Drivers
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Whatever the legal situation, do not drive when you believe fatigue makes you unsafe. OSHA’s driver guidance says: “Drivers must also commit to safe vehicle operation and never drive while distracted, drowsy, or impaired.”
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