Glossary · Operating Authority & Compliance
HOS 70-Hour Rule (8-Day).
FMCSA Hours-of-Service rule limiting commercial drivers to 70 hours of on-duty time in any 8 consecutive days; resets via 34-hour rest.
What it is
The HOS 70-hour rule is the FMCSA regulation limiting commercial drivers to 70 hours of on-duty time within any rolling 8-day period. It applies to carriers operating every day of the week. An alternative 60-hour / 7-day rule applies to carriers that do not operate every day of the week — the carrier picks the cycle that fits its operation, and individual drivers fall under whichever cycle their carrier uses.
The 8-day calculation is rolling, not calendar-week: each day, the oldest day rolls off and the most recent day rolls in. Reset is available through the 34-hour restart provision — a 34-hour off-duty rest period clears the 8-day clock entirely and the driver starts the next shift with a fresh 70-hour budget. ELD systems track the 8-day clock automatically and display the recap of remaining on-duty hours so drivers can plan ahead.
Why it matters for trucking finance
The 70-hour rule structures weekly revenue capacity for owner-operators. Roughly 60–65 hours of practical driving per week (after the 14-hour windows and 30-minute breaks consume some non-driving on-duty time) translates to a sustained ~3,000–3,500 miles per week. That weekly mileage cap is the upper bound on revenue capacity for a solo driver.
Carriers managing fleet schedules optimize 8-day cycles around this constraint. For owner-operators, planning the 34-hour restart strategically (often a weekend reset) maximizes weekly mileage — and weekly mileage maps directly to weekly revenue, equipment payments, and factoring cash flow. Team drivers double the available driving hours by splitting the clock, which is why team operations command premium freight rates.
Related terms
- Hours of Service (HOS) — FMCSA rules limiting daily and weekly driving time for commercial drivers, designed to prevent fatigue-related crashes.
- HOS 34-Hour Restart — Optional FMCSA Hours-of-Service provision allowing a 34-hour off-duty period to reset the 8-day (70-hour) cumulative on-duty clock.
- 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.
- 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.
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