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CDL Practice Test: Logbook Rules

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CDL Practice Test: Logbook Rules

Logbook Rules Questions

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Good Luck!

Under the adverse driving conditions exception, how many additional hours can you drive?
  • 5 extra hours
  • 3 extra hours
  • 4 extra hours
  • 2 extra hours
This is a question from page 95 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

What Is the Adverse Driving Conditions Exception?

If unexpected adverse driving conditions slow you down, you may drive up to 2 extra hours to complete what could have been driven in normal conditions. This means you could drive for up to 13 hours, which is 2 hours more than allowed under normal conditions. Adverse driving conditions mean things that you did not know about when you started your run, like snow, fog, or a shut-down of traffic due to a crash. Adverse driving conditions do not include situations that you should have known about, such as congested traffic during typical “rush hour” periods.

Even though you may drive 2 extra hours under this exception, you must not drive after the 14th consecutive hour after coming on duty.

Example: You begin to work at 7:00 a.m., start driving at 8:00 a.m., and drive 9 hours when you hit heavy fog at 5:00 p.m. The fog was not forecasted. At this point, the adverse driving conditions exception would allow you to drive for 4 more hours (2 hours to get to 11 and 2 extra hours due to the fog), taking you to 9:00 p.m. for a total of 13 hours of driving.

If, however, you come to work at 7:00 a.m., start driving at 12:00 p.m. and drive into fog at 5:00 p.m., you could still only drive until 9:00 p.m. for a total of 9 hours of driving. You would have to stop driving at 9:00 p.m. because you would have reached the 14 hour limit.

TruckingTruth's Advice:

The adverse driving conditions exception may come in handy from time to time. If you run into unexpected weather conditions or have an unexpected delay such as a road closure, you can extend your 11 hour driving limit. Don't take advantage of this exception, but by all means use it when necessary. Just be sure to mark the time, location and type of the unexpected weather hazard on your logbook.

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What violations occurred on Day 2 of this example?

Day 1

Day 2


  • There is an 11 hour rule violation and a 30 minute break violation
  • There is a 14 and 11 hour rule violation
  • There is a 14 and 11 hour rule violation as well as a 30 minute break violation
  • There is a 14 hour rule violation and a 30 minute break violation
This is a question from page 102 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

Day 1

Day 2

Violations: There are a total of 3 violations on Day 2. First, there is a 14 hour rule violation from 1:00 a.m. - 2:00 a.m. Second, there is a 30 minute break violation from 8:00 p.m - midnight. And third, there is also an 11 hour rule violation from 11:00 p.m. - midnight.

Explanation - 11 Hour Limit: After 10 consecutive hours off duty using a combination of off duty and sleeper berth time, the driver was eligible to drive for up to 11 hours starting at 10:00 a.m. on Day 1. By 2:00 a.m. on Day 2, the driver had driven 9 hours. By obtaining 10 consecutive hours off duty on Day 2, the 11 hour calculation point moved to noon on Day 2, at which point the driver had 11 hours of driving time available again. The driver violated the 11 hour rule by driving beyond the 11 hour limit between 11:00 p.m. and Midnight.

Explanation - 30 Minute Break: On Day 1, the driver was never required to take a 30 minute break because the longest stretch of on duty time during the entire day was only 6 consecutive hours. On day 2, the driver never took a minimum of 30 consecutive minutes off duty, even after remaining in the driver's seat for more than 8-hours. At 8:00 p.m. the driver was in violation of the 30 minute break provision and remained in violation for the remainder of the day.

Explanation - 14 Hour Limit: After 10 consecutive hours off duty, the driver had 14 hours available at 10:00 a.m. on Day 1. The driver reached the 14 hour limit at midnight (the 5-hour sleeper-berth period is included in the 14 hour calculation because it was less than 8 hours). Though the driver was not eligible to drive a CMV after midnight, he or she was able to continue working on duty without violation, as long as no driving took place (which was done for 1 hour). The driver violated the 14 hour rule by driving a CMV at 1:00 a.m. Then, after 10 consecutive hours off duty, the 14 hour calculation point moved to noon on Day 2, at which point the driver had 14 hours available to work again.

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EOBR's are required to automatically record which of the following?
  • All of these answers are correct
  • Engine use
  • Miles driven
  • Road speed
This is a question from page 106 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

Manufacturers of EOBRs must certify that their devices meet the minimum requirements. This includes a requirement that an EOBR must be mechanically or electronically connected to the truck to automatically record, at a minimum, engine use, road speed, miles driven, the date, and time of day. Drivers enter other information required to complete the hours-of-service records. The vast majority of EOBRs now use GPS tracking to meet these requirements.

TruckingTruth's Advice:

Most EOBRs are integrated within satellite communication systems that drivers and dispatchers use to communicate with each other.

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If you have used up all of your 14 hour on duty time, how many hours would you regain after an 8 hour break in the sleeper berth?
  • Your 14 hour limit would reset
  • You will still have no hours remaining
  • You would regain half of your hours (7 hours total)
  • None of these answers are correct
This is a question from page 95 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

Eight hours of sleeper berth time:

You may also use the sleeper berth to extend the 14 hour limit. Any period in the sleeper berth of at least 8 consecutive hours will not count as part of the 14 hours, and, therefore, would allow you to extend the time during which you could use your maximum 11 hours of driving.

TruckingTruth's Advice:

An 8 hour break will never add more hours to any of your limits. Rather, an 8 hour break simply extends your time by not counting the break against your 14 hour duty clock. The concept is confusing, but it's actually very simple. Here are some examples.

  • If you have 5 hours remaining on your 14 hour duty clock then go into the sleeper berth for 8 hours, at the end of your break you will still have 5 hours remaining.
  • If you have 1 hour remaining on your 14 hour duty clock then go into the sleeper berth for 8 hours, at the end of your break you will still have 1 hour remaining.
  • If you have 0 hours remaining on your 14 hour duty clock then go into the sleeper berth for 8 hours, at the end of your break you will still have 0 hours remaining.
  • As you can see, you will not gain any hours back after taking an 8 hour break. Instead, your available hours have simply been extended.

    So why would you ever want to take an 8 hour break instead of a 10 hour break? Here's an example:

    Let's say you have a delivery in the morning, but you are not allowed to park at your delivery location overnight. Instead, you have to stop at a truck stop 20 miles away to park for the night. In order to make your appointment on time, you must leave after only resting for 8 hours. If that's the case, you can still make the delivery on time by taking an 8 hour break instead of a full 10 hour break.

    Little situations like this will come up frequently as a truck driver. That's why it's so important to understand these little loopholes and tricks. We'll go through more examples later on in this section, but try to have a full understanding of the 10, 8 and split sleeper rules.

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On which of the below logs did a violation occur?

Day 1

Day 2

  • Day 2 contains at least one violation
  • No violations occurred on either day
  • Day 1 contains at least one violation
  • Both days contain at least one violation
This is a question from page 98 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

Day 1

Day 2

Violations: There are no violations in this example.

Explanation - 11 Hour Limit: After 10 consecutive hours off duty, the driver had 11 available hours of driving and began driving at 11:00 a.m. on Day 1. The driver drove between the hours of 11:00 a.m. until 4:00 p.m. (5 hours), went off duty for 1 hour, then drove between 5:00 p.m. and 11:00 p.m. (6 hours). No more driving was completed on Day 1 so the driver did not exceed the 11 hour driving limit (5 + 6). Starting at Midnight going into Day 2, the driver may not drive a CMV until he/she goes off duty for a minimum of 10 consecutive hours, which is indicated on the log. On Day 2, the driver only operated a CMV for 3 hours and so no violation occurred.

Explanation - 30 Minute Break: The 1 hour off duty break between 4:00 p.m. and 5:00 p.m. on Day 1 fulfilled the 30 minute break requirement. While only 30 minutes off duty is required, taking a break longer than 30 minutes (as in this case) is perfectly legal. The driver may drive a CMV only if 8 hours or less have passed since the end of the driver’s last off duty period of at least 30 minutes. On Day 2, the driver was only on duty for a 3 hour stretch which wouldn't require the 30 minute break. Both Day 1 and Day 2 of this example are free from any 30 minute break violations.

Explanation - 14 Hour Limit: After taking 10 consecutive hours off duty, the driver changed to on duty status at 10:00 a.m. on Day 1. This is the calculation point for the 14 hour limit so the driver has until Midnight to complete all driving tasks. At midnight, the driver switched to the sleeper berth for 10 consecutive hours. Since the driver performed all driving tasks within 14 hours on Day 1, no violation occurred. No violation occurred on Day 2, either, since the driver was only on duty (driving) for a total of 3 hours.

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Is the below example a completed 34 hour restart?

Day 1

Day 2

  • Yes, the restart has been completed
  • No, the driver didn't spend enough time off duty to complete the restart
  • None of these answers are correct
  • No, the driver didn't complete two rest periods between 1:00 a.m. and 5:00 a.m.
This is a question from page 105 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

Day 1





Day 2







Explanation - 34 Hour Restart: In this example, the 34 hour restart has been completed successfully. The driver took 34 consecutive hours off duty from 1:00 a.m. on Day 1 until 5:00 a.m. on Day 2. Not only does this satisfy the 34 hour consecutive break requirement, but it also satisfies the two required break periods between 1:00 a.m. and 5:00 a.m. At 5:00 a.m. on Day 2, the drivers 34 hour break was completed and his/her 70 hour limit would reset.

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Which statement below is false?
  • Authorized government inspectors may check your logs at any time
  • You never need to log your days off
  • The current day's log must be current to your last change of duty status
  • You must have a log for each day of the last 8 days
This is a question from page 96 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

You are required to account for every day on your log, even days off, unless you are covered by a logbook exception on any of the days. The log must cover all 24 hours of every day.

Authorized government inspectors may check your logs at any time. You must have a log for each day of the last 8 days that you were required to log (you might have been under an exception on some of those days). The current day’s log must be current to your last change of duty status. Inspectors check your logs to see if you have violated the hours of service regulations. Violations of the hours of service regulations can result in being fined and/or placed out of service.

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What does the 14 hour on duty limit mean?
  • You can drive up to 14 consecutive hours per day
  • You must rest for at least 14 consecutive hours each day
  • You are allowed to drive for 7 hours then must take a 7 hour break
  • From the time you first go on duty after a 10 consecutive hour break, you are allowed 14 consecutive hours to use your 11 hour drive time
This is a question from page 93 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

The 14 Hour Duty Limit

This limit is usually thought of as a "daily" limit, even though it is not based on a 24 hour period. You are allowed a period of 14 consecutive-hours of duty time after being off duty for 10 or more consecutive hours. The 14 consecutive hour duty period begins when you start any kind of work (performing vehicle maintenance, loading / unloading cargo, fueling, etc.). Once you have reached the end of this 14 consecutive hour period, you cannot drive again until you have been off duty for another 10 consecutive hours.

Your driving is limited to the 14 consecutive hour duty period even if you take some off duty time, such as a lunch break or a nap, during those 14 hours.

Example: You have had 10 continuous hours off and you begin working at 6:00 a.m. (vehicle inspection, fueling, loading / unloading freight, etc.). You must not drive your truck after 8:00 p.m. that evening. You may do other work after 8:00 p.m.(load / unload freight, perform maintenance duties, etc.), but you cannot do any more driving until you have taken another 10 consecutive hours off.

TruckingTruth's Advice:

The 14 hour rule quite simply means that as soon as you begin working for the day, regardless of what time it is, you have 14hrs to complete your day. Once your 14 hours are up, you may not drive again until you have had a minimum of 10 consecutive hours off duty, at which point, your 14 hour clock will reset.

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