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

Logbook & ELD (Hours of Service) for the CDL Exam — UK 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 British candidates.

For candidates aiming to clear this exam on the first attempt, the difference between Band 6 and Band 7+ — or "passing" and "comfortable margin" — usually comes down to fluency on a small number of high-leverage topics. 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 globally was 65% (FMCSA — applies to UK candidates testing in the U.S.). For UK candidates preparing for CDL, the calibration of study to local context matters: UK candidates often take exams for both domestic licensure (NMC, GMC) and migration purposes. IELTS UKVI is a separate, higher-stakes track.

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).
5In the UK, CDL schedules and reschedules align with state holiday calendars and post-Brexit fee adjustments — confirm pricing on the awarding body's site before booking.

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 British candidates?

The published first attempt rate for CDL candidates globally in 2024 was 65%, according to FMCSA — applies to UK candidates testing in the U.S.. 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 British 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. UK candidates often take exams for both domestic licensure (NMC, GMC) and migration purposes. IELTS UKVI is a separate, higher-stakes track. 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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