CDL · Logbook & ELD (Hours of Service) · United States

Logbook & ELD (Hours of Service) for the CDL Exam — U.S. candidates

5% of the CDL test plan. Hours-of-service rules limit driving to 11 hours within a 14-hour duty window after 10 hours off; ELDs (Electronic Logging Devices) automate enforcement. Calibrated for American candidates.

Examiners do not award marks for content alone — they award them for the ability to demonstrate competency in the precise format the test demands. Logbook & ELD (Hours of Service) sits at roughly 5% of the Commercial Driver License content distribution — HOS violations are among the most common roadside-inspection failures. The 11-hour drive limit, 14-hour window, 60/70-hour weekly limits, and 30-minute break rule are tested on the General Knowledge exam and enforced via ELDs. In 2024, the published first attempt rate for CDL candidates in United States was 65% (FMCSA / state DMV aggregate (representative figure)). For U.S. candidates preparing for CDL, the calibration of study to local context matters: U.S. licensure exams are governed at the state level (CDL, NCLEX) or by national boards (MCAT, GRE). Pearson VUE and PSI are the dominant test-delivery vendors.

Common failure modes

These are the patterns that cause most candidates to lose marks on this topic. Recognising them in advance is half the work.

!Confusing the 14-hour window (cannot extend) with the 11-hour drive limit
!Forgetting the mandatory 30-minute break after 8 cumulative hours of driving
!Missing the 34-hour restart eligibility
!Not understanding short-haul exception (150 air-mile radius, return to terminal)

Study tips

1Memorize the four HOS limits: 11 / 14 / 60 / 70 / 30-min break.
2Drill the 34-hour restart math: 34 consecutive hours off-duty resets the 60- or 70-hour clock.
3Practice ELD edit log sequence — drivers can edit only off-duty status changes; driving time is locked.
4Know the short-haul exception threshold (150 air-mile radius, return same day).
5If you are testing in the U.S., expect CDL delivery via Pearson VUE or PSI test centres — register through the official board portal at least 30 days in advance.

Sample CDL Logbook & ELD (Hours of Service) questions

These sample items mirror the format and difficulty of real CDL questions. Practice with thousands more on the free Koydo question bank.

1
After how many cumulative hours of driving must a CDL driver take a 30-minute break?
- A6 hours
- B7 hours
- C8 hoursCorrect
- D10 hours
Why this answer?
The FMCSA rule requires a 30-minute break after 8 cumulative hours of driving. The break may be off-duty, sleeper-berth, or on-duty (not-driving) status.

Frequently asked questions

Are paper logs still allowed?

Paper logs are no longer permitted for most interstate CDL operations. Limited exceptions exist for vehicles built before 2000 and short-haul drivers within the 150-mile radius rule.

What is the CDL Logbook & ELD (Hours of Service) pass rate for American candidates?

The published first attempt rate for CDL candidates in United States in 2024 was 65%, according to FMCSA / state DMV aggregate (representative figure). Pass rates within specific topics like Logbook & ELD (Hours of Service) are not separately published, but the topic represents roughly 5% of the exam.

How long should American candidates study Logbook & ELD (Hours of Service) for the CDL?

For most candidates, focused mastery of Logbook & ELD (Hours of Service) requires 20–40 hours of deliberate practice — drilling sample questions, reviewing failure modes, and timing yourself against exam conditions. U.S. licensure exams are governed at the state level (CDL, NCLEX) or by national boards (MCAT, GRE). Pearson VUE and PSI are the dominant test-delivery vendors. Combine Logbook & ELD (Hours of Service) study with full-length mock exams in the final two weeks before your test date.

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