What are the Hours of Service Rules for Truck Drivers

Key Takeaways

• The 14-hour window runs whether or not you’re driving. Weekly totals roll daily. The 30-minute break requirement is tied to cumulative driving hours, not total on-duty time. Auditing your own logs before an inspection costs nothing; getting caught costs a lot.

Tracking commercial driving limits manually is a headache – not because the math is hard, but because the overlapping windows are easy to lose track of. One missed entry can ground a truck for 10 to 34 hours or trigger a fine that wipes out a week of margin.

The Core Math of FMCSA Regulations

The FMCSA structures its safety rules under Title 49, Parts 300–399 of the Code of Federal Regulations, built around the body’s natural 24-hour cycle.

The 14-Hour On-Duty Window

Once you clock in after 10 consecutive hours off duty, a 14-hour countdown starts – and it doesn’t pause for anything. Traffic, a loading dock delay, a long lunch: none of it matters. When 14 hours are gone, you’re done driving until you’ve completed another full 10-hour rest period.

The 11-Hour Driving Limit

Inside that 14-hour window, you can drive for a maximum of 11 hours. The interaction between these two numbers catches drivers: spend 6 hours loading, and you’re left with 8 hours of available drive time — not because of the 11-hour rule, but because the 14-hour wall comes first. Whichever limit you hit first is the one that counts.

+-----------------------------------------------------------+
|                 14-Hour On-Duty Window                    |
+------------------------------------+----------------------+
|       11-Hour Driving Limit        | Non-Driving On-Duty  |
+------------------------------------+----------------------+

The 30-Minute Break Requirement

After 8 cumulative hours of driving without a break, you need at least 30 consecutive minutes off – logged as off-duty, sleeper berth, or non-driving on-duty time. Miss it, and your ELD flags a non-compliance event the moment you log that 8-hour mark.

The 60-Hour and 70-Hour Weekly Limits

This is where it gets hard to track without a tool.

Drivers don’t work Monday to Friday. Compliance uses a rolling lookback:

• 60-Hour / 7-Day: Carriers that don’t run vehicles every day of the week cap drivers at 60 hours on-duty over any rolling 7-day period.
• 70-Hour / 8-Day: Carriers that operate every day use an 8-day window with a 70-hour cap.

The balance updates at midnight – the oldest day’s hours drop off, and that time gets added back to your available total.

The 34-Hour Restart

If your weekly hours are gone, you don’t have to wait day by day for them to expire. Thirty-four consecutive hours off-duty -sleeper berth, off the clock, or a mix – resets your rolling total to zero.

How a Digital HOS Checker Works

Doing this manually means building a matrix of your last eight days. A digital tool does it automatically, running your time entries through a fixed sequence: find your 10-hour rest periods, measure each shift window, total the driving blocks, check for the 30-minute break, and sum on-duty hours across the lookback window. If any check fails, it flags the exact minute non-compliance started.

What Non-Compliance Actually Costs

A roadside officer can put a driver out of service on the spot. The truck sits at a weigh station or truck stop for the full required rest period — then come the late delivery fees, towing, and the CSA score hit. The pressure that leads here is real: unpaid dock wait time routinely pushes drivers to stretch their hours to protect their pay. One inspection failure, from a single missed log entry, can run into thousands of dollars.

References

Adjei, G. (2026). Sustainable Transportation Practices: Reducing Carbon Emissions. Sarcouncil Journal of Entrepreneurship and Business Management, 5(2), 13–17.

Board, T. R. (2016). Hours-of-Service Regulations – Commercial Motor Vehicle Driver Fatigue, Long-Term Health, and Highway Safety. National Academies of Sciences, Engineering, and Medicine. National Academies Press.

Ju, S., & Belzer, M. H. (2024). Follow the money: Trucker pay incentives, working time, and safety. The Economic and Labour Relations Review, 35(1), 7–26. https://doi.org/10.1017/elr.2024.5

Teoh, E. R. (2016). Large truck safety regulations and enforcement priorities in the United States. Insurance Institute for Highway Safety (IIHS), 1–12.