Vermont Doubles / Triples CDL Practice Test
Below are 25 exam-style questions for the Vermont Doubles / Triples CDL knowledge test, modeled on the FMCSA-aligned content used by the Vermont Department of Motor Vehicles. 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 No air-brake system
- B Mechanical brakes only
- C Air lines only on the tractor
- D Air lines from tractor to first trailer to dolly to second trailer
- A Increase speed
- B Brake within the curve
- C Slow down before the curve to reduce rollover risk and trailer swing
- D Maintain speed
- A Two tractors pulling one trailer
- B Two trailers behind one tractor
- C A bus with two sections
- D A trailer with two axles
- A A tire blowout
- B A driver punishing the truck
- C The rear trailer swinging more than the tractor in turns or lane changes
- D A loose load shifting
- A Accelerate
- B Brake hard
- C Steer sharply to correct
- D Reduce speed gradually and avoid sudden steering inputs
- A In Canada only
- B Only on Interstate 80
- C In some states; restrictions vary
- D On all U.S. highways
- A Plan the change well in advance, signal early, and change when there is ample space
- B Skip the signal
- C Cut between cars
- D Change quickly to fit in
- A T endorsement allows triples everywhere
- B Restrictions apply only to hazmat
- C There are no restrictions
- D Federal and state rules vary; T endorsement does not override route restrictions
- A Off-tracking is less than a single trailer
- B Use the left lane
- C Off-tracking is more pronounced; swing wider than for a single trailer
- D No off-tracking occurs
- A Ignore the damage
- B Continue with damaged tires
- C Replace before operating
- D Use the spare
- A Nothing happens
- B The tractor brakes apply
- C The second trailer's emergency brakes apply automatically
- D The first trailer accelerates
- A Verify they are crossed under the pintle hook and not dragging
- B Tie them in knots
- C Skip the inspection
- D Allow them to drag
- A Use the trailer hand valve
- B Leave brakes off
- C Set only the tractor parking brake
- D Set parking brakes on the tractor and on the trailers
- A Verify the fifth wheel locks around the kingpin and test by tugging gently
- B Trust visual inspection only
- C Skip the lock verification
- D Couple at high speed
- A Accelerate
- B Brake hard
- C Reduce speed gradually and avoid sudden steering inputs
- D Steer sharply to correct
- A No specific length
- B Tractor length only
- C Trailer length only
- D Total combination length when turning, parking, and changing lanes
- A It can sway and lift more easily; drive carefully
- B No change in handling
- C It is harder to roll over
- D Better fuel mileage
- A It uses different brakes
- B Total length and weight increase stopping distance and require more reaction time
- C It accelerates faster
- D It is shorter
- A Skip the brake-light test
- B Skip the parking-brake test
- C All of the above
- D Skip the air-leak rate check
- A Coupling and uncoupling procedures
- B All of the above
- C How to inspect each connection point
- D State and federal route restrictions
- A Plan the turn carefully and use multiple lanes if necessary
- B Turn sharply
- C Skip the planning
- D Maintain speed
- A Is the same as a fifth wheel jaw
- B Is electrical
- C Is decorative
- D Prevents accidental release of the hook
- A Any lane
- B The left lane
- C The shoulder
- D The right lane on multilane highways when possible
- A Avoid freeways
- B Take the shortest route regardless
- C Drive only at night
- D Avoid restricted roads and minimize sharp curves and steep grades
- A Allow chains to drag
- B Skip the safety chains
- C Allow loose engagement
- D Verify it is properly engaged and safety chains are attached
Study tips for the Vermont Doubles / Triples exam
The Doubles / Triples portion of the Vermont CDL exam is graded out of the bank of questions the Vermont Department of Motor Vehicles draws from each year. While the exact bank is not published, every question is sourced from the Doubles / Triples chapter of the Vermont 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 Vermont 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 Vermont Department of Motor Vehicles 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 Vermont 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 Vermont 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 Vermont Department of Motor Vehicles office.
Already comfortable with this endorsement? Drill another: VT General Knowledge · VT Air Brakes · VT Combination Vehicles · VT Hazardous Materials · VT Passenger · VT School Bus · VT Tank Vehicle
New to the CDL process in Vermont? Read How to apply for a CDL in Vermont for the document checklist and step-by-step timeline.