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newSchoolWorks.com › VoTechWorks › Transportation › Commercial Driving (CDL) › Hours of Service Compliance and Electronic Logging Devices (ELD) › Lesson 1
TRN-CDL23-06 · Lesson 1 · 4 clock hours · theory

HOS Regulatory Framework and Duty-Status Categories

Objective. Students will correctly identify all four duty-status categories, the driving and on-duty time limits for property-carrying and passenger-carrying drivers, and the 60/70-hour weekly limits by stating them aloud and labeling a blank log grid with 100% accuracy.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a certified examiner or master technician in the trade or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

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Why Hours of Service Rules Exist

Fatigue is one of the leading human-performance hazards in commercial trucking. The Federal Motor Carrier Safety Administration (FMCSA) Hours of Service (HOS) regulations set legally enforceable limits on how long a commercial motor vehicle (CMV) driver may drive and be on duty before rest is required. Every driver subject to HOS rules must understand these limits before operating a CMV — violations can result in being placed out of service roadside, fines for the carrier, and, most seriously, preventable crashes.

The Four Duty-Status Categories

Every minute of a commercial driver's day must be recorded in one of exactly four duty-status categories. These categories are the foundation of any log, paper or electronic.

1. Off Duty (OFF) — The driver is completely relieved of all responsibility for the vehicle and cargo. Rest at a motel, personal errands, and leisure time all qualify. Time must be genuinely free from work obligations.

2. Sleeper Berth (SB) — The driver is resting in a sleeper berth compartment that meets FMCSA standards. This status is only available on vehicles equipped with a qualifying berth and is central to the sleeper-berth split provision discussed below.

3. Driving (D) — The driver is physically operating the CMV. This is the most restricted category and triggers the primary time limits.

4. On Duty Not Driving (ON) — Any work-related activity that is not driving: pre-trip and post-trip inspections, fueling, loading and unloading, waiting at a shipper's dock while responsible for the cargo, completing paperwork, and time at a scale house. If you are on the clock and not driving, this is your status.

Safety note: Misclassifying on-duty time as off-duty time is a federal records-of-duty-status (RODS) falsification violation. It defeats the entire purpose of HOS rules and endangers everyone on the road.

Property-Carrying Driver Limits

Most Class A and B drivers haul freight and fall under the property-carrying rules.

Passenger-Carrying Driver Limits

Drivers of buses and other passenger-carrying CMVs operate under slightly different limits:

Weekly (7/8-Day) Limits — The 60/70-Hour Rule

In addition to daily limits, drivers are subject to rolling weekly limits based on the carrier's operating schedule:

Restart provision: A driver may restart their 7- or 8-day clock by taking at least 34 consecutive hours off duty. Confirm current regulatory details on the FMCSA website, as restart provisions have been subject to rulemaking.

The Sleeper-Berth Split Provision

Property-carrying drivers with a qualifying sleeper berth may split their required off-duty time into two periods instead of taking 10 consecutive hours at once. Under current rules, one period must be at least 8 consecutive hours in the sleeper berth; the other period must be at least 2 consecutive hours, taken either in the sleeper berth or off duty, or a combination. Neither shorter period counts against the 14-hour window. When the two periods are paired, the driver's driving and on-duty limits reset as though the combined off-duty time was taken at once. Always verify the current rule wording with the FMCSA HOS Summary card, as this provision has been revised.

Applying Duty Status Safely and Accurately

When in doubt about which status applies, ask: Am I driving? If yes — Driving. Am I doing any work task or am I responsible for this vehicle or cargo? If yes — On Duty Not Driving. Am I in the sleeper berth with no work responsibility? If yes — Sleeper Berth. Otherwise? — Off Duty.

Accurate logging is a federal safety requirement. An ELD records driving time automatically, but the driver is legally responsible for all other status entries and for certifying the log's accuracy. Never allow gaps in your log, and never back-annotate time to make limits appear met when they were not.

Key terms10

Hours of Service (HOS)FMCSA regulations that set maximum driving and on-duty time limits for CMV drivers to reduce fatigue-related crashes.
Duty-Status CategoryOne of the four official classifications — Off Duty, Sleeper Berth, Driving, and On Duty Not Driving — used to account for every minute of a driver's day on a record of duty status.
14-Hour On-Duty WindowThe consecutive-hour period, beginning when a property-carrying driver comes on duty after 10 hours off, during which driving is permitted; driving is prohibited after this window expires regardless of hours driven.
11-Hour Driving LimitThe maximum number of hours a property-carrying CMV driver may drive within the 14-hour window following 10 consecutive hours off duty.
60/70-Hour Weekly LimitRolling limits on cumulative on-duty hours over 7 or 8 consecutive days (60 hours/7 days or 70 hours/8 days) after which a driver may not drive until sufficient on-duty hours have dropped off the rolling window.
Sleeper-Berth Split ProvisionA rule allowing property-carrying drivers with a qualifying sleeper berth to divide required off-duty rest into two separate periods, one at least 8 hours in the berth and one at least 2 hours, rather than taking all rest consecutively.
30-Minute Break RequirementThe rule that a property-carrying driver must take at least a 30-minute break after 8 cumulative hours of driving before driving again.
On Duty Not DrivingAny work-related activity performed by the driver that does not involve physically operating the CMV, such as pre-trip inspections, loading, fueling, and waiting at a shipper while responsible for the cargo.
34-Hour RestartA provision allowing a driver to reset the 7- or 8-day cumulative on-duty clock by taking at least 34 consecutive hours off duty.
Record of Duty Status (RODS)The official log — paper or electronic — documenting a driver's duty-status category for each minute of every 24-hour period; required to be accurate, complete, and retained.

Worked examples4

1. A property-carrying driver comes on duty at 6:00 a.m. on Monday after 10 consecutive hours off duty. By what time must the driver stop driving under the 14-hour rule, and what is the latest clock time the driver could finish the 11th hour of driving?
  1. Step 1: Identify the on-duty start time — 6:00 a.m.
  2. Step 2: Add 14 hours to find the end of the on-duty window: 6:00 a.m. + 14 hours = 8:00 p.m. The driver cannot drive at or after 8:00 p.m.
  3. Step 3: Check the 11-hour driving limit separately. The driver may drive up to 11 hours total within that window, but cannot drive past 8:00 p.m. regardless of how many driving hours remain.
  4. Step 4: If the driver used all 11 driving hours back-to-back starting at 6:00 a.m., driving would end at 5:00 p.m. — still inside the 14-hour window.
  5. Step 5: The binding limit depends on which is reached first: 11 hours of driving OR the 8:00 p.m. window close. Whichever comes first stops further driving.
Answer: The driver must stop driving by 8:00 p.m. (the 14-hour window). If driving continuously from 6:00 a.m., the 11-hour drive limit would be hit at 5:00 p.m., making 5:00 p.m. the actual driving cutoff in that scenario.
2. A driver has logged the following on-duty hours over 7 consecutive days (operating for a carrier that does not operate CMVs every day): Mon 9 hrs, Tue 10 hrs, Wed 8 hrs, Thu 11 hrs, Fri 9 hrs, Sat 7 hrs, Sun 5 hrs. How many on-duty hours has the driver accumulated, and may the driver drive on the following Monday?
  1. Step 1: Add the on-duty hours for all 7 days: 9 + 10 + 8 + 11 + 9 + 7 + 5 = 59 hours.
  2. Step 2: The applicable limit for a carrier that does not operate CMVs every day is 60 hours in 7 consecutive days.
  3. Step 3: The driver has 59 hours accumulated with 1 hour remaining under the 60-hour limit.
  4. Step 4: On the following Monday, Monday's hours drop off the 7-day rolling window (Monday of the prior week falls outside the current 7-day period), freeing up those 9 hours.
  5. Step 5: New 7-day total after Monday rolls off: 59 − 9 = 50 hours, leaving 10 hours available before hitting the 60-hour limit.
Answer: The driver has accumulated 59 on-duty hours and has 1 hour left for Sunday. On the following Monday, the prior Monday's 9 hours roll off, making 10 on-duty hours available, so driving is permitted.
3. A driver comes on duty at midnight (00:00). The driver does a 1-hour pre-trip inspection (on duty not driving), then drives from 01:00 to 09:00 (8 hours of driving). The driver must take the required 30-minute break. After the break, how many more hours may the driver drive before hitting the 11-hour driving limit, and does the 14-hour window still allow it?
  1. Step 1: Calculate driving hours so far: 09:00 − 01:00 = 8 hours driven.
  2. Step 2: The 30-minute break resets eligibility to drive again (the 8-hour cumulative driving clock that triggers the break requirement). After the break the driver may continue driving.
  3. Step 3: Driving hours remaining under the 11-hour limit: 11 − 8 = 3 hours.
  4. Step 4: Calculate the 14-hour window end: on-duty start 00:00 + 14 hours = 14:00 (2:00 p.m.).
  5. Step 5: The break ends at 09:30 at the earliest. From 09:30, 3 more driving hours would end at 12:30 p.m. — before the 14:00 window close.
  6. Step 6: Both limits allow continued driving. The driver may drive up to 3 more hours after the break, finishing no later than 14:00.
Answer: The driver has 3 driving hours remaining (11 − 8 = 3). The 14-hour window closes at 14:00 (2:00 p.m.), and finishing 3 hours after a 09:30 break end gives 12:30 p.m. — within the window. Both limits are satisfied.
4. A property-carrying driver uses the sleeper-berth split provision. The driver takes an 8-hour sleeper-berth period from 10:00 p.m. to 6:00 a.m., then drives for 4 hours, then takes a 2-hour off-duty period. How many driving hours remain for the paired rest cycle, and does the 2-hour period count against the 14-hour window?
  1. Step 1: Confirm the split meets minimum requirements: 8-hour sleeper-berth period — meets the 'at least 8 hours in the berth' requirement. 2-hour off-duty period — meets the 'at least 2 hours' requirement.
  2. Step 2: Under the split provision, neither period individually counts against the 14-hour window when the two periods are paired.
  3. Step 3: Driving hours used so far in this driving period: 4 hours.
  4. Step 4: Once both periods of the split are complete, the driver's limits reset. The driver may drive up to 11 hours total in the new driving period, with 11 − 4 = 7 hours remaining (the 4 hours driven between the two split periods count toward the limit).
  5. Step 5: The 2-hour off-duty period does not count against the 14-hour window because it is a qualifying split-provision period.
Answer: After completing the paired split (8-hour SB + 2-hour off duty), the driver has 7 driving hours remaining (11 − 4 driven between splits = 7). The 2-hour off-duty period does not count against the 14-hour on-duty window.
In class: Instructor-led walkthrough of the FMCSA Hours of Service regulations using the current FMCSA Hours of Service Summary reference card; students annotate personal copies and highlight limits, definitions, and the sleeper-berth split provision. · Small-group sorting activity: students receive a deck of 30 scenario cards describing driver actions (fueling, pre-trip inspection, waiting at a shipper, driving, napping in sleeper berth) and must sort each card into the correct duty-status category, then defend their answers to the class. · Individual written exercise: given a blank 24-hour log grid, students plot a complete duty-status day including an 8-hour sleeper-berth period and a 30-minute rest break, label all time blocks, and calculate on-duty and driving totals for the day.
Materials: FMCSA Hours of Service Summary (current edition, fmcsa.dot.gov), blank paper log forms (FMCSA-compliant grid format), duty-status scenario card deck, whiteboard, markers
Check: Students complete a 20-question written quiz covering duty-status definitions, hour limits, and sleeper-berth rules; pass mark is 80% (16/20 correct).

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

Hours of Service / Records of Duty Status
1. Which of the four duty-status categories applies when a property-carrying driver is waiting at a shipper's dock while remaining responsible for the cargo?
Hours of Service / Records of Duty Status
2. A property-carrying driver comes on duty at 7:00 a.m. after 10 consecutive hours off. At what time does the 14-hour on-duty window close?
Hours of Service / Records of Duty Status
3. A property-carrying driver comes on duty at 7:00 a.m. after 10 consecutive hours off. At what time does the 14-hour on-duty window close?
Hours of Service / Records of Duty Status
4. Under HOS rules for passenger-carrying drivers, what is the maximum number of hours a driver may drive after 8 consecutive hours off duty?
Hours of Service / Records of Duty Status
5. A driver works for a carrier that operates CMVs every day of the week. After how many cumulative on-duty hours in 8 consecutive days is the driver prohibited from driving?
Hours of Service / Records of Duty Status
6. A property-carrying driver has driven 8 consecutive hours without a break. Under HOS rules, what must happen before the driver may drive again?
Hours of Service / Records of Duty Status
7. In the sleeper-berth split provision for property-carrying vehicles, what is the minimum duration required for the longer of the two split rest periods?
Hours of Service / Records of Duty Status
8. A driver records a 45-minute nap in the truck's qualifying sleeper berth while off duty from cargo responsibility. Which duty-status category should be logged for that time?
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