Interstate carriers answer to the Federal Motor Carrier Safety Regulations, and violations become the spine of a negligence case:
- Hours of service (49 CFR Part 395) — driving-time limits enforced through electronic logging devices. ELD data showing a driver past his window converts "he seemed drowsy" into a documented violation.
- Maintenance and inspection records (Part 396) — brake and tire failures are rarely acts of God; they are skipped inspections with a paper trail.
- Driver qualification files (Part 391) — a carrier that hired a driver with a disqualifying record owns that decision as negligent hiring.
The truck's engine control module records speed, braking, and throttle in the seconds before impact. None of this evidence waits: ELD data cycles, trucks are repaired and returned to service, and carriers' counsel are on the case the day of the crash. A spoliation letter demanding preservation of the ECM download, the ELD logs, and the driver's file must go out immediately — it is the single most time-sensitive act in a truck case.