Glossary · Operating Authority & Compliance
HOS 11-Hour Driving Rule.
FMCSA Hours-of-Service rule limiting commercial drivers to 11 hours of driving within a 14-hour on-duty window; requires 10 hours off-duty before reset.
What it is
The HOS 11-hour rule is the FMCSA regulation under 49 CFR 395.3(a)(3) limiting property-carrying commercial drivers to 11 consecutive hours of driving per shift. The 11 driving hours sit within a 14-hour on-duty window (the separate 14-hour rule) and require a 30-minute break after 8 cumulative driving hours.
Before the 11-hour clock resets, the driver must take 10 consecutive hours off-duty. ELD enforcement makes the rule automatic — the device cuts off legal driving status at the 11-hour mark, and roadside inspection of the ELD record produces an immediate out-of-service citation if the driver attempts to keep driving. The 11-hour rule applies to property-carrying CMV drivers; passenger-carrying drivers operate under a slightly different framework (10-hour driving limit within a 15-hour window). Adverse driving conditions can extend the 11-hour limit by up to 2 hours under a specific exception.
Why it matters for trucking finance
The 11-hour rule defines the maximum daily mileage capacity at highway speeds: roughly 600–700 miles per day for OTR operations under realistic conditions. Carriers and shippers plan loads around this constraint, and any margin calculation for owner-operator routes implicitly assumes the 11-hour cap. Routes that look profitable on paper but require 12 driving hours to complete are not actually viable.
HOS violations are CSA point-generating events with high frequency. Chronic violations push CSA percentiles into intervention thresholds, hurting insurance pricing and broker access. Operators who push past 11 hours risk both the citation AND fatigue-related accident exposure — the most expensive kind of preventable claim, and one that insurance underwriters specifically track.
Related terms
- Hours of Service (HOS) — FMCSA rules limiting daily and weekly driving time for commercial drivers, designed to prevent fatigue-related crashes.
- HOS 14-Hour Window — FMCSA Hours-of-Service rule defining the 14-hour on-duty window during which 11 hours of driving and required breaks must occur.
- ELD — Electronic Logging Device that automatically records driving time, replacing paper logbooks; mandated for most CDL operators since December 2017.
- CSA Score (CSA) — FMCSA Compliance, Safety, Accountability program scoring system that rates carrier safety performance using roadside inspection and crash data.
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