Fatigue is one of the most common — and most preventable — causes of serious truck crashes. A drowsy driver behind the wheel of an 80,000-pound vehicle is a danger to everyone on the road. The good news for injured victims is that federal rules limit how long truckers can drive, and modern trucks record the data needed to prove when those rules were broken.

The federal hours-of-service rules

The Federal Motor Carrier Safety Administration (FMCSA) sets hours-of-service limits to keep tired drivers off the road. For most property-carrying commercial drivers, the core rules include:

  • An 11-hour driving limit after 10 consecutive hours off duty
  • A 14-hour on-duty window within which all driving must occur
  • A required 30-minute break after 8 hours of driving
  • A weekly cap of 60 hours in 7 days or 70 hours in 8 days

There are exceptions and special situations, but when a driver exceeds these limits — or a company pressures them to — that violation can be strong evidence of negligence.

How a truck’s data proves fatigue

This is where trucking cases differ from ordinary car crashes. Two sources of electronic evidence often tell the real story:

  • The electronic logging device (ELD). Federal law requires most commercial trucks to use an ELD that automatically records driving time. It is far harder to falsify than the old paper logbooks, and it can show a driver had been on the road too long.
  • The black box (engine control module). The truck’s onboard computer records data like speed, braking, and throttle in the moments before impact — which can corroborate that a driver never reacted, consistent with falling asleep.

Driver qualification files, dispatch records, and even fuel and toll receipts can fill in the rest of the picture.

Why this evidence has to be preserved fast

Here is the catch: trucking companies are only required to keep some of these records for a limited time, and data can be overwritten in the normal course of business within days or weeks. Once it is gone, it can be impossible to recover. That is why acting quickly matters — a lawyer can send a formal preservation (spoliation) letter that puts the company on notice that destroying this evidence carries serious legal consequences.

What to do if you suspect driver fatigue

If you were hurt in a crash and suspect the trucker was fatigued, do not wait. The faster a Florida truck accident lawyer can step in, the more likely it is that the ELD logs, black-box data, and company records can be preserved and used to hold the right parties accountable. Consultations at Kutner Personal Injury are free, and there is no fee unless we win.

This article is for general information only and is not legal advice. Every case is unique — contact a qualified attorney about your specific situation.