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Butler Personal Injury Law Blog

For decades, Conlon Tarker, P.C. has fought for injured individuals and families in Butler, Pennsylvania, delivering honest guidance and proven personal injury representation when it matters most.

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Oct 14, 2026

by Conlon Tarker P.C.

| Truck Accidents

How Driver Fatigue Contributes to Tractor-Trailer Crashes

Driver fatigue can cause tractor-trailer crashes by slowing reaction time, reducing attention, and making it easier for a driver to miss hazards, drift from a lane, or fall asleep behind the wheel. Federal trucking rules limit how long commercial drivers can drive, but a driver can still be too tired to operate safely even before reaching those limits.

In Butler County, tractor-trailers regularly travel routes such as I-79, I-76, U.S. 422, and Route 8, putting tired truck drivers alongside commuters and other motorists. If a fatigued truck driver caused your crash, contact Conlon Tarker P.C. for legal advice. Our truck accident attorneys in Butler County can investigate the driver’s hours, records, and the trucking company’s role.

Why Driver Fatigue is Dangerous in Butler County Truck Crashes

Besides making drivers sleepy, fatigue can also significantly affect their reaction time, judgment, attention, and vision. For a tractor-trailer driver, even a small delay can matter. A fully loaded truck needs a significant distance to slow down, so a tired driver who doesn’t notice stopped traffic quickly enough may cause a serious rear-end crash. Fatigue can also lead to:

  • Drifting across lane lines
  • Missing traffic signals or signs
  • Following other vehicles too closely
  • Making unsafe lane changes
  • Briefly falling asleep
  • Reacting too late to avoid a collision

Federal Hours-of-Service Rules for Truck Drivers

Hours-of-service (HOS) rules are federal limits on how long commercial truck drivers can drive and how much time they must spend off duty to rest. Under 49 C.F.R. § 395.3, a driver of a property-carrying commercial vehicle generally must have 10 consecutive hours off duty before starting a driving period, may drive for up to 11 hours, and can’t drive after being on duty for 14 consecutive hours. Except when an applicable exception applies, driving is not permitted after more than eight cumulative hours of driving without at least one consecutive 30-minute interruption in driving status.

These limits are meant to reduce fatigue-related crashes, but staying within the HOS limits doesn’t automatically mean a driver was alert enough to drive safely. Under 49 C.F.R. § 392.3, a truck driver can’t operate a commercial motor vehicle when fatigue has impaired or is likely to impair the driver’s alertness enough to make driving unsafe. The rule also prohibits a motor carrier from requiring or allowing the driver to continue.

How a Trucking Company May Contribute to Driver Fatigue

A trucking company may become part of the investigation if its scheduling, dispatching, supervision, or other practices contributed to the driver’s unsafe condition. For instance, a carrier may create unrealistic delivery schedules, pressure a driver to keep moving, or fail to respond when a driver reports being too tired to continue. Being within hours-of-service limits doesn’t automatically answer whether a driver was safe to drive.

Records That May Reveal Driver Fatigue

Fatigue may not be obvious from the crash scene, so investigators may need to reconstruct the driver’s hours and activities before the collision. Records may include:

  • Electronic logging device data
  • Records of duty status
  • Dispatch messages
  • GPS records
  • Fuel receipts
  • Toll records
  • Delivery schedules
  • Cellphone records
  • Rest-stop or surveillance footage

For example, imagine a tractor-trailer crashes on I-79 in Butler County shortly before a scheduled delivery. The driver’s log may show the required rest, but GPS and dispatch records could reveal when the truck was actually moving and how long the driver had been working. Those records may help determine whether fatigue contributed to a crash.

A fatigue-related tractor-trailer crash may involve more than a tired driver. The driver’s schedule, the carrier’s practices, the hours actually worked, and the records maintained by the trucking company can all matter.

If you sustained injuries in a tractor-trailer crash, our Butler County truck accident attorneys can investigate whether fatigue contributed and whether the driver, motor carrier, or another party may be responsible. Request your complimentary consultation by reaching Conlon Tarker at 724-285-7700 or online.