CDL Practice Tests

Our CDL practice tests are designed to help test your knowledge of the CDL Manual and sharpen your skills for taking the CDL permit and endorsement exams. They are not designed to teach you the knowledge necessary to pass the exams. Please do not try to memorize CDL practice tests in order to get your CDL. There's a better way.

Our High Road CDL Training Program is by far the easiest and most effective way to learn the materials necessary for passing your written CDL exams and preparing for a great start to your career. We strongly suggest using the High Road (which is 100% free!) to learn the CDL manual before using our CDL practice questions to test your knowledge.

CDL Practice Tests: Dominate The CDL Exam!

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Question #78 (1 of 10)

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Define "Reaction Distance":

  • The distance you will continue to travel, in ideal conditions; before you physically hit the brakes in response to a hazard seen ahead
  • The distance your vehicle will travel in ideal conditions, while you are braking.
  • The distance your vehicle travels, in ideal conditions, from the time your eyes see a hazard until your brain recognizes it.
  • The total minimum distance your vehicle has traveled, in ideal conditions, with everything considered, until you can bring your vehicle to a complete stop.

Reaction Distance. The distance you will continue to travel, in ideal conditions; before you physically hit the brakes in response to a hazard seen ahead. The average driver has a reaction time of three-fourths second to one second. At 55 mph this accounts for 61 feet traveled.

Memorize this definition. You may see it on the test and you need to understand it.
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Question #519 (2 of 10)

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For manual slack adjustors, the brake pushrod should not move more than _________ (with the brakes released) when pulled by hand.

  • 1 foot
  • 1 inch
  • 6 inches
  • 2 inches
For manual slack adjustors, the brake pushrod should not move more than 1 inch (with the brakes released) when pulled by hand.
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Question #21 (3 of 10)

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Interstate commerce is when you drive a CMV:

  • From one State to another State or a foreign country
  • Between two places within a State, but the cargo or passengers are part of a trip that began or will end in another State or foreign country
  • All the answers are correct
  • Between two places within a State, but during part of the trip, the CMV crosses into another State or foreign country
  • From one State to another State or a foreign country;
  • Between two places within a State, but during part of the trip, the CMV crosses into another State or foreign country; or
  • Between two places within a State, but the cargo or passengers are part of a trip that began or will end in another State or foreign country.
Interstate travel means you have left your home state during the trip. If you stay within your home state, it's considered intrastate. Take your time and read the questions and answers carefully so you don't get the two mixed up.
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Question #55 (4 of 10)

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If you are starting on an incline, you must not roll back when you begin moving. You may hit someone behind you. If you have a manual transmission vehicle, what should you do?

  • Hold the clutch firmly to the floor while slightly giving it gas, then hold the brake
  • Partly engage the clutch before you take your right foot off the brake.
  • Hold the brake firmly, release the clutch completely, then put some power to the wheels. Finally, release the brake.
  • Release the brake completely with the clutch firmly to the floor. Slowly give the engine power, re-apply the brake, then release the clutch completely.
If you have a manual transmission vehicle, partly engage the clutch before you take your right foot off the brake.
If you roll backward when starting on an incline during your road test, it is an automatic failure.
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Question #647 (5 of 10)

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Your trailer has a 6 inch hole spacing in the tandem slider rail and your trailer tandems are 900 pounds overweight. What is the minimum number of holes you will have to slide the tandems to get the tandems within legal limits?

  • 2 holes
  • 4 holes
  • 3 holes
  • 1 hole
The two main hole spacings you'll find are 4 inches and 6 inches. You can estimate that you will move 250 pounds per hole for 4 inch spacing, and 400 pounds per hole for 6 inch spacing.
6 inch hole spacing means you'll move approximately 400 pounds per hole. In order to move a minimum of 900 pounds, you have to move at least 3 holes (400 x 3 = 1200).
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Question #256 (6 of 10)

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Why is spring force used instead of air for emergency and parking brakes?

  • All of these are correct
  • Springs prevent movement in both directions, air may not
  • Springs produce more power than air
  • Air pressure can eventually leak away

All trucks, truck tractors and buses must be equipped with emergency brakes and parking brakes. Mechanical force must hold them on because air pressure can eventually leak away. Spring brakes are usually used to meet these needs.

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Question #465 (7 of 10)

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When stopping a school bus at a bus stop, what is the last thing you must do before completely opening the door and signaling students to approach?

  • All these are correct
  • Pump the brakes at least 5 times to reduce air pressure in the parking brakes
  • Make a final check to see that all traffic has stopped
  • Beep the horn to make sure students are paying attention

When stopping, you should:

  • Bring the school bus to a full stop with the front bumper at least 10 feet away from students at the designated stop. This forces the students to walk to the bus so you have a better view of their movements.
  • Place transmission in “Park” (if there is no “Park” shift point, place in “Neutral” and set the parking brake at each stop.
  • Activate alternating red lights when traffic is a safe distance from the school bus and ensure stop arm is extended.
  • Make a final check to see that all traffic has stopped before completely opening the door and signaling students to approach.
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Question #94 (8 of 10)

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What have tests shown about trucks with a high center of gravity?

  • If you follow the speed limit in a curve you'll be fine because they design the posted speed limits to account for heavily loaded trucks with a high center of gravity
  • They can roll over at the posted speed limit for a curve.
  • They can cause congested roadways because of their additional length
  • They can go around a curve a little more quickly than a truck with a lower center of gravity
Tests have shown that trucks with a high center of gravity can roll over at the posted speed limit for a curve.
You must get your speed down before entering a curve. Enter a curve too fast and it might be your last. Stay well below the posted speed limit in the curve. They design those speed limits for cars, not for loaded trucks with a high center of gravity.
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Question #503 (9 of 10)

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When doing a pre-trip inspection of the engine compartment, which of the following are you NOT looking for?

  • Look for puddles on the ground.
  • Make sure the air lines are properly attached to the trailer
  • Inspect hoses for condition and leaks.
  • Look for dripping fluids on the underside of the engine and transmission.

Engine Compartment (Engine Off) Leaks/Hoses

  • Look for puddles on the ground.
  • Look for dripping fluids on underside of engine and transmission.
  • Inspect hoses for condition and leaks.
The air lines do not connect to the trailer inside the engine compartment.
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Question #528 (10 of 10)

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In addition to checking the lighting indicators listed in Section 10.2 of this manual, school bus drivers must also check which of the following lighting indicators:

  • Alternately flashing amber lights indicator, if equipped.
  • All these are correct
  • Alternately flashing red lights indicator.
  • Strobe light indicator, if equipped.

In addition to checking the lighting indicators listed in Section 10.2 of this manual, school bus drivers must also check the following lighting indicators (internal panel lights):

  • Alternately flashing amber lights indicator, if equipped.
  • Alternately flashing red lights indicator.
  • Strobe light indicator, if equipped.
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