Hours of Service Rules for Truck Drivers: A Compliance Guide for Carriers

What Are Hours of Service Rules?

Hours of service (HOS) rules are federal regulations that limit how many consecutive hours a commercial truck driver can operate a vehicle. The standard rule is 11 hours of driving per 14-hour workday, followed by a mandatory 10-hour off-duty period. These rules exist because fatigue impairs judgment and reaction time the same way alcohol does—a driver who has been awake for 18+ hours performs like a driver with a 0.08% blood alcohol level (the legal impairment threshold). For owner-operators and small carriers, understanding and tracking HOS compliance is not optional; violations result in fines ranging from several hundred dollars per infraction to higher penalties for repeat offenders, and your FMCSA Safety Profile gets marked, which affects insurance rates and shipper confidence.

Federal Hours of Service Limits

The FMCSA (Federal Motor Carrier Safety Administration) sets the baseline HOS rules that apply to most interstate carriers:

• 11-hour driving limit: A driver may not drive more than 11 hours in a single duty period (the time from when they start work until they take a 10-hour break).
• 14-hour workday: A driver's on-duty time (driving + non-driving work like loading/unloading, waiting at shipper, fueling, paperwork) cannot exceed 14 consecutive hours starting from the time they start work.
• 10-hour off-duty minimum: Before starting a new duty period, a driver must be off-duty (not working) for at least 10 consecutive hours.
• 60-hour / 7-day rule: A driver cannot work more than 60 hours of on-duty time in any 7 consecutive days. Some carriers use a rolling 8-day calculation instead.
• 30-minute break requirement: After driving 8 consecutive hours, a driver must take a 30-minute break (off-duty, sleeper berth, or certain exceptions).

These rules apply to drivers operating commercial motor vehicles (CMVs) with a GVWR (gross vehicle weight rating) over 10,001 pounds that cross state lines or carry hazardous materials. Intrastate-only carriers (operating only within one state) may have different rules set by that state, so you must check your state's motor carrier requirements.

How Hours Are Tracked and Documented

For decades, drivers logged their hours on paper—the old "logbook" system using grid paper to mark drive time, on-duty time, sleeper berth time, and off-duty time. Since December 2017, the FMCSA has required electronic logging devices (ELDs) for most drivers subject to HOS rules. An ELD is a device that automatically records a driver's hours from the vehicle's engine (automatically recording when the vehicle is moving = driving time) and requires the driver to manually log on-duty and off-duty time.

ELDs must timestamp each record, prevent false logging (you cannot backdate hours), and interface with inspection software that FMCSA and state inspectors use to check compliance during roadside stops. Most modern ELDs also help drivers and dispatchers track their hours in real-time so a driver knows when they'll hit their 11-hour driving limit or 14-hour workday limit, and the dispatcher can schedule relief drivers or assign shorter routes to stay compliant.

A few exemptions exist—farmers hauling their own crops, drivers of vehicles under 10,001 GVWR, and drivers working for certain household goods carriers or specific agricultural operations—but if you're hauling for hire or running a general freight operation, you need an ELD or are out of compliance.

Common Violations and Penalties

HOS violations fall into several categories:

For drivers, fines can add up quickly. For carriers, violations affect your FMCSA CSA (Compliance, Safety, Accountability) scores—high scores lead to audit triggers, shipper blacklists, and insurance rate increases. A single HOS violation might cost $300 in fines plus $1,000+ in insurance premium increases over the following year.

State-Specific Variations

While FMCSA sets the federal floor, some states impose stricter requirements. Some states require shorter maximum on-duty periods, more frequent breaks, or stricter penalties for violations. Additionally, rules for intrastate-only carriers (those operating only within their state) are set by that state—not the FMCSA—and vary widely. You must check your state's motor carrier regulations and your DOT's guidance; common sources include your state's Department of Transportation, the Motor Carrier Safety Assistance Program (MCSAP), or your state's trucking association. Do not assume federal rules apply to intrastate operations in your state.

Staying Compliant: Systems and Best Practices

1. Use a Reliable ELD

Choose an ELD certified by FMCSA with a good driver interface. Your ELD vendor should provide real-time alerts when drivers approach their 11-hour or 14-hour limit so they can plan accordingly.

2. Train Drivers on HOS Rules

Many violations come from driver confusion, not intentional violation. Spend time during onboarding explaining the 11/14/10 framework, the 30-minute break rule, and how to read their ELD. Remind them that hitting a 10-hour rest period isn't just compliance—it's safety.

3. Dispatch with HOS Awareness

Before assigning a load, check how many hours the driver has left in their cycle. A driver with 2 hours left cannot take a 3-hour job; you'll either need a second driver or shorter work. Routing software that factors in HOS can prevent last-minute scrambles.

4. Monitor and Audit Records

Pull ELD reports weekly to spot patterns (drivers consistently at the edge of limits, frequent off-duty time edits, gaps in records). Some violations are honest mistakes; some indicate dishonesty. Address them early with the driver or investigate further if needed.

5. Track Compliance in Your Business Systems

If you're managing multiple drivers and routes, a system that centralizes driver files, HOS alerts, and compliance history helps. FleetClear watches regulatory deadlines—MCS-150 biennial updates, UCR, IFTA, IRP, driver medical card renewals, insurance filings—and alerts you before they expire. Staying compliant isn't just about HOS, but about the full compliance calendar. You can sign up free to track your first compliance item and see how it fits your workflow.

What Happens in an Inspection

During a roadside inspection (Level 1 or Level 3 = comprehensive safety audit), FMCSA or state inspectors will request the driver's ELD records for the past 7-8 days. The inspector uses federal inspection software that reads ELD data and flags violations—you cannot talk your way past the data. Common inspection findings related to HOS include:

• Insufficient off-duty time between duty periods
• Excessive on-duty time in a single 14-hour window
• Excessive driving hours in a 7-day period
• ELD record gaps or anomalies (missing timestamps, manual edits, inconsistencies with vehicle telemetry)
• Missing or unreadable ELD records

An inspection that finds HOS violations results in an "out-of-service" order for that driver (they cannot legally drive until resolved) and a citation for the carrier. If you have multiple drivers with HOS violations, your carrier profile may trigger an FMCSA investigation.

Frequently Asked Questions

Q: Do I need an ELD if I own just one truck?

If you operate that truck across state lines or carry hazardous materials, and your vehicle GVWR is over 10,001 pounds, then yes—the ELD requirement applies to your operation regardless of fleet size. The exemptions are narrow (mostly agriculture and certain household goods carriers), so check your specific operation. If you run intrastate-only, check your state's rules—some states don't require ELDs for intrastate carriers, but others do.

Q: What's the difference between "on-duty" and "driving"?

Driving time is only when the vehicle is moving. On-duty time includes driving plus any other work—fueling, waiting for a load, pre-trip inspections, paperwork, loading/unloading if you're responsible, customer conversations, etc. A driver can work 14 hours on-duty but only 11 of those can be spent driving. The remaining 3 hours are on-duty non-driving. After 14 hours on-duty, the driver must take a 10-hour off-duty rest regardless of actual driving time.

Q: Can a driver take the 10-hour rest in a sleeper berth?

Yes. The FMCSA allows off-duty time to be split between the cab/sleeper berth and other off-duty locations. For example, a driver could take 5 hours sleeper berth and 5 hours off-duty at a truck stop or home. The key requirement is 10 consecutive hours of not working. Some states have different sleeper berth rules, so check your state if you run intrastate.

Q: What penalty does my carrier face if a driver violates HOS rules?

Your carrier can receive a civil penalty from FMCSA ranging from a few hundred dollars per violation upward for repeat or egregious violations. Beyond fines, violations appear on your FMCSA CSA scores and Safety Profile, which affects: insurance rates (often increase 5–15% per violation), shipper reputation (many large shippers audit CSA scores and blacklist carriers with high violations), and the likelihood of FMCSA opening an investigation or audit into your operations. A single driver violation can cascade into hundreds of dollars in business impact.