Maine Doubles / Triples CDL Practice Test
Below are 25 exam-style questions for the Maine Doubles / Triples CDL knowledge test, modeled on the FMCSA-aligned content used by the Maine Bureau 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 Skip the testing
- B Some lines may be optional
- C Test only one line
- D All air lines and electrical lines should be connected and tested
- A Random order
- B Reverse of coupling — disconnect rear trailer first, then dolly
- C No specific order
- D Disconnect tractor first
- A A trailer for transporting animals
- B A converter dolly
- C A tractor only
- D A short trailer commonly used in doubles and triples
- A Allow the dolly to roll
- B Set the parking brake or chock the wheels before disconnecting
- C Disconnect at high speed
- D Skip the parking brake
- A Signal early and change smoothly to minimize swing
- B Change in heavy traffic
- C Change at high speed
- D Change quickly without signaling
- A All of the above
- B Increased rollover risk in curves
- C Reduced visibility around the second trailer
- D Crosswind sensitivity
- A Skip the floor inspection
- B Allow damage
- C Look for damage that could affect cargo securement or trailer integrity
- D Inspect once a year
- A Allow loose engagement
- B Verify it is properly engaged and safety chains are attached
- C Skip the safety chains
- D Allow chains to drag
- A Connect a semitrailer to another trailer to form a combination
- B Replace the fifth wheel on the tractor
- C Move cargo within the trailer
- D Test the brakes
- A Back at full speed
- B Avoid it; if necessary, uncouple to a single trailer first
- C Have a passenger guide you
- D Use only mirrors
- A Brake hard
- B Accelerate
- C Steer sharply to correct
- D Reduce speed gradually and avoid sudden steering inputs
- A Accelerate
- B Steer sharply
- C Brake hard
- D Reduce speed gradually and avoid sudden steering inputs
- A Increase speed
- B Slow down and reduce steering input — rollover is imminent
- C Brake hard
- D Continue normally
- A Tractor length only
- B Trailer length only
- C No specific length
- D Total combination length when turning, parking, and changing lanes
- A Brake within the curve
- B Maintain speed
- C Slow down before the curve to reduce rollover risk and trailer swing
- D Increase speed
- A Use the left lane
- B Off-tracking is less than a single trailer
- C No off-tracking occurs
- D Off-tracking is more pronounced; swing wider than for a single trailer
- A There are no restrictions
- B T endorsement allows triples everywhere
- C Federal and state rules vary; T endorsement does not override route restrictions
- D Restrictions apply only to hazmat
- A The rear trailer swinging more than the tractor in turns or lane changes
- B A tire blowout
- C A driver punishing the truck
- D A loose load shifting
- A Use only mirrors
- B Avoid backing whenever possible; use a spotter when needed
- C Skip the spotter
- D Back at full speed
- A In some states; restrictions vary
- B Only on Interstate 80
- C On all U.S. highways
- D In Canada only
- A Avoid freeways
- B Avoid restricted roads and minimize sharp curves and steep grades
- C Take the shortest route regardless
- D Drive only at night
- A Potential rollover at curves
- B Crosswind effects on the rear trailer
- C Lane changes that swing the rear
- D All of the above
- A Better handling
- B Fewer inspection points
- C No effect on safety
- D More opportunities for tire failure and more inspection points
- A First (closest to the tractor)
- B It does not matter
- C In the middle
- D Last (furthest from the tractor)
- A A trailer with two axles
- B Two trailers behind one tractor
- C Two tractors pulling one trailer
- D A bus with two sections
Study tips for the Maine Doubles / Triples exam
The Doubles / Triples portion of the Maine CDL exam is graded out of the bank of questions the Maine Bureau 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 Maine 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 Maine 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 Maine Bureau 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 Maine 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 Maine 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 Maine Bureau of Motor Vehicles office.
Already comfortable with this endorsement? Drill another: ME General Knowledge · ME Air Brakes · ME Combination Vehicles · ME Hazardous Materials · ME Passenger · ME School Bus · ME Tank Vehicle
New to the CDL process in Maine? Read How to apply for a CDL in Maine for the document checklist and step-by-step timeline.