Fatigued truck drivers cause crashes. The federal government has known this for decades, and the Federal Motor Carrier Safety Administration (FMCSA) enforces specific limits on how long commercial drivers can drive without rest. When a driver violates those limits and a crash follows, the violations become powerful evidence in a catastrophic injury case — both as direct proof of negligence and as a basis for higher damages.
The Federal Hours-of-Service Rules
FMCSA's hours-of-service regulations (49 CFR Part 395) apply to most interstate commercial motor vehicle drivers. The core rules for property-carrying drivers:
- 11-hour driving limit. A driver may drive a maximum of 11 hours after 10 consecutive hours off duty.
- 14-hour duty limit. A driver may not drive beyond the 14th consecutive hour after coming on duty, following 10 hours off duty.
- 30-minute break. A driver must take a 30-minute break when they have driven for 8 cumulative hours without at least a 30-minute break.
- 60/70-hour limit. A driver may not drive after 60 hours on duty in 7 consecutive days, or 70 hours in 8 consecutive days. A driver can restart this clock with 34 consecutive hours off duty.
- Sleeper berth provision. Drivers using sleeper berths can split their off-duty time into specific segments under defined rules.
Different rules apply to passenger-carrying drivers, drivers in adverse conditions, and certain regional or short-haul exceptions.
The Electronic Logging Device Mandate
Since 2017, most commercial drivers are required to use an Electronic Logging Device (ELD) that records driving hours automatically. The ELD replaced paper logs that were notoriously easy to falsify. ELDs synchronize with the truck's engine and record:
- Engine power-on and shutdown times.
- Vehicle motion status (driving vs. stationary).
- Miles driven.
- Duty status changes (off duty, sleeper berth, driving, on duty not driving).
- Driver identification.
- Location data.
The data is retained by the carrier for at least six months and must be made available to FMCSA inspectors and (in litigation) to plaintiffs through subpoena and discovery.
How Hours-of-Service Cases Get Built
When a truck crash involves a possible hours-of-service violation, the case-building sequence usually looks like this:
1. Immediate evidence preservation
A spoliation letter goes to the carrier within days of the crash demanding preservation of:
- ELD data for the trip and the 7-8 days preceding.
- Bills of lading and dispatch records.
- Driver qualification file.
- Driver's daily logs (paper backup, if any).
- Receipts (fuel, tolls, meals) that establish location and time.
- Cell phone records.
- The truck's ECM (engine control module) data.
Our companion guide on the first 24 hours of evidence preservation covers the broader picture.
2. ELD analysis
An expert — often a former FMCSA inspector or a transportation safety consultant — analyzes the ELD data against the federal hours-of-service rules. The analysis identifies specific violations: hours driven over the limit, missed 30-minute breaks, exceeded duty windows, missed required off-duty periods.
3. Cross-referencing third-party data
Independent evidence is used to check the ELD data. Toll transponder records show actual location and time. Fuel receipts show stops. Cell phone records show when the driver was active. Surveillance video at fuel stops and weigh stations can confirm or contradict the logs.
4. The motor carrier's role
Hours-of-service cases often expand beyond the driver to the trucking company itself. Patterns of carrier behavior — pressuring drivers to violate hours, failing to monitor ELD data, dispatching trips that cannot be completed within legal hours — turn driver-error cases into corporate-negligence cases. The carrier's discovery file usually includes:
- Dispatch records showing what schedules were assigned.
- Driver communications (texts, emails) showing pressure to drive.
- Internal safety records and prior FMCSA inspection results.
- The carrier's compliance with FMCSA's Compliance, Safety, Accountability (CSA) scoring system.
Why hours-of-service violations matter for damages. A documented violation of federal safety regulations supports both compensatory damages and, in many states, punitive damages. The carrier's pattern of violations often expands the case beyond the driver to the company.
The Most Common Violation Patterns
- Driving past the 11-hour limit. The classic violation. ELD data makes it harder to hide.
- Driving past the 14-hour duty window. Often caused by loading delays that the driver did not account for.
- "Personal conveyance" abuse. Misclassifying driving time as personal use to avoid the duty clock.
- ELD tampering. Various schemes to falsify the data, almost all of which leave forensic traces.
- Operating without an ELD when required. Either no device installed or a "Yard Move" / "Personal Conveyance" misuse.
- Carrier dispatch violations. Schedules that cannot be completed within legal hours.
If You Were Hurt in a Truck Crash
Time matters in truck crash cases. ELD data may be overwritten on rolling retention. The truck's ECM data is sometimes erased when the vehicle is returned to service. A free case review focused on a truck crash starts with rapid evidence preservation, then evaluates the case as the data comes in.
- Read about catastrophic truck crash cases: Catastrophic truck accidents.
- Read about evidence preservation: The First 24 Hours.
- Read about event data recorders: What an EDR Shows.
Free case review. No Fees Unless We Recover Money for You.
Sources
- Federal Motor Carrier Safety Administration (FMCSA) — Hours-of-Service Regulations. fmcsa.dot.gov
- FMCSA — Electronic Logging Devices (ELD) rulemaking and resources. fmcsa.dot.gov/hours-service/elds
- FMCSA — Compliance, Safety, Accountability (CSA) program. csa.fmcsa.dot.gov
- National Transportation Safety Board (NTSB) — Investigations of commercial truck crashes. ntsb.gov
- 49 CFR Part 395 — Hours of Service of Drivers. ecfr.gov