New Jersey CDL Combination Test (NJ) 2026

4.9 out of 5 (63 votes)
80% Passing score
20 Questions
4 Mistakes allowed
As a New Jerseyan, getting your Commercial Driver's License (CDL) combination vehicles endorsement is a crucial step towards a rewarding driving career. Our New Jersey DMV practice test is designed to prepare you thoroughly for this important milestone. The NJ permit practice test includes a diverse range of multiple-choice questions that cover all key areas, such as coupling and uncoupling, pre-trip inspections, driving techniques, backing and maneuvering, and air brake systems. With 20 questions to tackle, you need to get at least 16 right to pass, ensuring you're well-prepared for the road. One of the standout features of our NJ combination vehicle test is the ease of scheduling. Available online 24/7, you can take the CDL combination test whenever it fits your busy schedule. This flexibility means you don't have to worry about fitting into the driving school's timetable, allowing you to study and take the test at your convenience. The New Jersey driving test practice also offers a broad variety of questions. Our extensive pool of questions and answers ensures you get comprehensive exposure to the topics you'll face in the DMV written test. This variety helps in reinforcing your knowledge and boosting your confidence as you prepare to ace the test. Another valuable aspect of our NJ combination CDL practice test is the test review feature. Once you've completed the practice permit test, you can go over your answers and review hints and explanations for any questions you missed. This immediate feedback helps you understand your mistakes and learn from them, enhancing your readiness for the actual CDL combination test. Understanding the increased stopping distances required for combination vehicles due to their greater weight is essential. Our NJ combination CDL practice test emphasizes this and other critical safety topics, ensuring you can handle the unique challenges of these larger, heavier vehicles. By mastering these topics through our knowledge test practice, you'll be well-prepared to drive safely and confidently on the road.
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Sample New Jersey Combination Test Questions

Question 1

How should the tractor be positioned before you begin backing under a semitrailer?

  1. A Approximately 12 degrees to the left of the trailer
  2. B With the driver-side locking jaw aimed at the kingpin
  3. C Approximately 20 degrees to the right of the trailer
  4. D Directly in front of and aligned with the trailer

Correct answer: D – Directly in front of and aligned with the trailer

The New Jersey CDL manual directs the driver to position the tractor directly in front of the trailer and verify alignment using both outside mirrors. Backing under at an angle can push the trailer sideways and damage its landing gear. After alignment, back slowly until the fifth wheel just touches the trailer.

Source: New Jersey Commercial Driver License Manual — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 2

After coupling, how should the trailer landing gear be positioned before driving?

  1. A One-third raised, with the crank secured
  2. B Halfway raised, with the crank secured
  3. C Three-quarters raised, with the crank secured
  4. D Fully raised, with the crank secured

Correct answer: D – Fully raised, with the crank secured

Raise the landing gear completely before driving and secure the crank handle. Landing gear left partly down may catch on railroad tracks or other objects. You must also verify adequate clearance between the landing gear and tractor frame and between the tractor tires and trailer nose.

Source: New Jersey Commercial Driver License Manual — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 3

If braking locks the trailer wheels and the trailer begins swinging out, what should you do?

  1. A Apply the trailer hand valve harder
  2. B Accelerate sharply
  3. C Steer sharply away from the trailer
  4. D Release the brakes to restore traction

Correct answer: D – Release the brakes to restore traction

Release the brakes to let the trailer wheels regain traction. Do not apply the trailer hand valve in an attempt to straighten the combination because further trailer braking can continue the skid. Once the wheels grip the road again, the trailer should begin following the tractor and straightening out.

Source: New Jersey Commercial Driver License Manual — § 6.1.5, “Prevent Trailer Skids”

Question 4

After disconnecting the air and electrical lines while uncoupling, which procedure is correct?

  1. A Secure the glad hands to dummy couplers or together if permitted, hang the electrical plug downward, and support the lines
  2. B Leave the glad hands open and place the electrical cable on the tractor frame
  3. C Hang the electrical plug upward and allow the air lines to swing freely
  4. D Place all connections on the ground beneath the trailer

Correct answer: A – Secure the glad hands to dummy couplers or together if permitted, hang the electrical plug downward, and support the lines

Connect the glad hands to the tractor’s dummy couplers when provided. If there are no dummy couplers, the glad hands may sometimes be coupled together when their design permits. Hang the electrical cable with its plug downward to keep out moisture, and support all lines where they will not be damaged while the tractor is driven.

Source: New Jersey Commercial Driver License Manual — § 6.4.2, “Uncoupling Tractor-Semitrailers”

Question 5

Why must wheel chocks be used when parking a trailer that has no spring brakes?

  1. A To keep weight off the landing gear
  2. B Because stored air can leak away and release the emergency brakes
  3. C To prevent the trailer air tanks from filling
  4. D Because chocks are needed only when the trailer faces downhill

Correct answer: B – Because stored air can leak away and release the emergency brakes

A trailer without spring brakes uses emergency brakes powered by air stored in its tank. Those brakes hold only while sufficient pressure remains; if the air leaks away, the brakes release. The New Jersey CDL manual requires wheel chocks to keep such a parked trailer from moving.

Source: New Jersey Commercial Driver License Manual — § 6.2.8, “Trailer Service, Parking and Emergency Brakes”

Question 6

What should you do before and while backing a trailer?

  1. A Inspect the intended path and use both outside mirrors
  2. B Back quickly to reduce the time spent maneuvering
  3. C Watch only the mirror on the driver’s side
  4. D Rely on the trailer to push small obstacles aside

Correct answer: A – Inspect the intended path and use both outside mirrors

Look at the intended path before backing and get out to inspect the area when necessary. Check side and overhead clearances, then use the outside mirrors on both sides frequently while moving. Back slowly so you can correct drift before the trailer moves too far off course.

Source: New Jersey Commercial Driver License Manual — § 6.1.7, “Backing with a Trailer”

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