Truck Driver Fatigue and Hours-of-Service Rules in California

Fatigue is not a vague accusation in a truck case. It is a regulated condition with numeric limits, electronic records, and a paper trail — which is why hours-of-service violations are among the most useful evidence an injured person can have.

Short answer: federal rules limit property-carrying commercial drivers to 11 hours of driving after 10 consecutive hours off duty, inside a 14-hour on-duty window, with a required 30-minute break and weekly caps of 60 or 70 hours. Exceeding those limits is a violation that can support a negligence claim. This is general information, not legal advice.

What the hours-of-service rules actually require

The limits for property-carrying drivers appear in 49 C.F.R. part 395:

Two features of these rules matter for a claim. First, they are objective: a violation is a number out of range, not a judgment call. Second, the 14-hour window is a clock, not a budget — once it starts, loading delays, traffic, and waiting all consume it, which is precisely the pressure that pushes drivers to keep going when they should stop.

Why fatigue produces severe crashes

A fatigued driver's reaction time lengthens, lane position degrades, and the ability to judge closing speed deteriorates — all of which matter enormously in a vehicle that may weigh many times what a passenger car does and needs correspondingly more distance to stop. Fatigue-related crashes also skew toward the worst kinds: drift-out-of-lane collisions, failure to slow for stopped traffic, and rear-end impacts at highway speed.

How a violation becomes evidence

Hours are no longer recorded only on paper. Electronic logging devices capture duty status automatically, and they can be cross-checked against records the driver cannot edit:

• Electronic logging device (ELD) data — duty status, driving time, and the sequence of the day
• Engine control module data — speed, braking, throttle, and often the moments before impact
• Fuel receipts, toll records, and weigh-station timestamps — which place the truck at a time and location
• Bills of lading and dispatch records — which show what the schedule actually demanded
• GPS and telematics — movement that either corroborates or contradicts the log

Where the log says one thing and the fuel receipts say another, the discrepancy is the finding. That is also why these records need to be requested quickly — see our guide to evidence that disappears after a truck crash.

The carrier's role in fatigue

Fatigue claims frequently reach past the driver. A dispatch schedule that cannot be completed within legal hours, a pay structure that rewards running over, a pattern of unaddressed log violations, or a failure to supervise hours at all can all support a claim against the carrier for its own conduct — not merely for the driver's. Our guide to who is liable in a California truck accident covers how those separate theories work.

If you were hit by a commercial truck

Get medical care promptly, make sure the crash is reported, and photograph the scene including the tractor, trailer, and any company markings or USDOT number — those identify the carrier. Then move quickly on records: the most probative evidence in a fatigue case is electronic, and electronic evidence has retention limits.

Our truck accident attorneys can send preservation demands and obtain the logs before they age out. Start with a free case evaluation — no fee unless we recover for you. Outcomes depend on the specific facts of each case.