New Jersey Doubles / Triples CDL Practice Test
Below are 25 exam-style questions for the New Jersey Doubles / Triples CDL knowledge test, modeled on the FMCSA-aligned content used by the New Jersey Motor Vehicle Commission. Try to answer each question on your own before reading the answer key directly under it. The questions and answer choices are shuffled deterministically per state and endorsement, so the order will stay the same on repeat visits — that lets you genuinely measure your improvement.
- A Ignore the damage
- B Use the spare
- C Continue with damaged tires
- D Replace before operating
- A Steer sharply to correct
- B Reduce speed gradually and avoid sudden steering inputs
- C Brake hard
- D Accelerate
- A Skip the charge
- B Use the trailer hand valve to charge
- C Couple without checking
- D Charge it before coupling and verify pressure
- A Leave brakes off
- B Use the trailer hand valve
- C Set only the tractor parking brake
- D Set parking brakes on the tractor and on the trailers
- A Can maintain normal speed
- B Should change lanes frequently
- C Should brake hard
- D Should be driven slowly with extra following distance
- A No specific length
- B Trailer length only
- C Total combination length when turning, parking, and changing lanes
- D Tractor length only
- A Inspect once a year
- B Allow damage
- C Skip the floor inspection
- D Look for damage that could affect cargo securement or trailer integrity
- A Crosswind effects on the rear trailer
- B All of the above
- C Potential rollover at curves
- D Lane changes that swing the rear
- A Trailers first, then tractor
- B Drop first trailer, hook converter dolly to first trailer, back tractor to second trailer, etc.
- C Tractor to second trailer first
- D Random order
- A Accelerate
- B Reduce speed gradually and avoid sudden steering inputs
- C Steer sharply
- D Brake hard
- A How to inspect each connection point
- B Coupling and uncoupling procedures
- C All of the above
- D State and federal route restrictions
- A Skip the lock verification
- B Trust visual inspection only
- C Verify the fifth wheel locks around the kingpin and test by tugging gently
- D Couple at high speed
- A Increase speed
- B Slow down before the curve to reduce rollover risk and trailer swing
- C Brake within the curve
- D Maintain speed
- A Skip the air check
- B Couple without verifying
- C Verify the dolly's air tank has air pressure and lock the dolly's parking brake before backing under the second trailer
- D Allow the dolly to roll freely
- A Continue normally
- B Brake hard
- C Slow down and reduce steering input — rollover is imminent
- D Increase speed
- A Brakes work better
- B Rear trailer can swing out and cause loss of control
- C Speed is reduced faster
- D Tractor cannot jackknife
- A No off-tracking occurs
- B Off-tracking is more pronounced; swing wider than for a single trailer
- C Use the left lane
- D Off-tracking is less than a single trailer
- A Reduced visibility around the second trailer
- B All of the above
- C Increased rollover risk in curves
- D Crosswind sensitivity
- A Turn sharply
- B Plan the turn carefully and use multiple lanes if necessary
- C Maintain speed
- D Skip the planning
- A Never; the dispatcher tests them
- B Before pulling away from the coupling site
- C Only at the destination
- D Once a year
- A Back at full speed
- B Skip the spotter
- C Avoid backing whenever possible; use a spotter when needed
- D Use only mirrors
- A Glad hands and seals at every connection
- B All of the above
- C Dolly air-tank pressure
- D Pintle hooks and safety chains
- A The rear trailer swinging more than the tractor in turns or lane changes
- B A tire blowout
- C A loose load shifting
- D A driver punishing the truck
- A Last (furthest from the tractor)
- B First (closest to the tractor)
- C In the middle
- D It does not matter
- A Skip the safety chains
- B Verify it is properly engaged and safety chains are attached
- C Allow chains to drag
- D Allow loose engagement
Study tips for the New Jersey Doubles / Triples exam
The Doubles / Triples portion of the New Jersey CDL exam is graded out of the bank of questions the New Jersey Motor Vehicle Commission draws from each year. While the exact bank is not published, every question is sourced from the Doubles / Triples chapter of the New Jersey CDL handbook, which itself is derived from the FMCSA Model Commercial Driver's License Manual. That means studying our practice tests, reading the corresponding handbook chapter, and re-reading the parts you got wrong is genuinely the most efficient route to a first-time pass.
Most successful applicants follow a simple cycle: take the practice test cold, write down every question you missed, open the matching chapter of the official New Jersey handbook, re-read the section that contains the right answer, then re-take the practice test 24 to 48 hours later. The 24-hour delay matters — sleep is when your brain commits new information to long-term memory, and CDL knowledge questions reward that kind of consolidated learning rather than cramming.
Pay particular attention to questions that include qualifier words like always, never, only, primary, or most. CDL test writers love to flip the right answer with a single qualifier. When two answer choices look almost identical, pay attention to the verb (is it must, should, or may?) and to any numbers (14 days, 100 air miles, 8 hours, 70/8 split). On endorsement tests in particular, watch for trick framing where a true statement about a different endorsement is offered as the "correct" answer to a question that is actually about Doubles / Triples.
Test-day logistics matter too. Bring photo ID, your Social Security card or birth certificate, your medical examiner's certificate (DOT card), and proof of state residency if you haven't already submitted those documents. The New Jersey Motor Vehicle Commission will not let you sit for the knowledge exam without your documentation, and most offices charge an additional fee for re-attempts. Arrive early — the wait at most CDL testing offices runs 30 to 60 minutes — and silence your phone before the exam begins.
Finally, keep your General Knowledge fundamentals sharp even when you're focused on the Doubles / Triples exam. Many states administer multiple knowledge tests in a single sitting, and questions on weight definitions (GVWR, GCWR, GAWR), stopping distance, and the pre-trip inspection routine show up across endorsements. If you're unsure on the basics, sit a fresh New Jersey General Knowledge practice test before scheduling the real exam.
Next steps
Missed more than four questions? Re-read the Doubles / Triples study guide and the matching chapter in the official New Jersey CDL handbook. Then come back and re-take the test. Once you can score 22 of 25 or higher on three runs in a row, you're in good shape to schedule the real exam at your local New Jersey Motor Vehicle Commission office.
Already comfortable with this endorsement? Drill another: NJ General Knowledge · NJ Air Brakes · NJ Combination Vehicles · NJ Hazardous Materials · NJ Passenger · NJ School Bus · NJ Tank Vehicle
New to the CDL process in New Jersey? Read How to apply for a CDL in New Jersey for the document checklist and step-by-step timeline.