Maryland Doubles / Triples CDL Practice Test
Below are 25 exam-style questions for the Maryland Doubles / Triples CDL knowledge test, modeled on the FMCSA-aligned content used by the Maryland Motor Vehicle Administration. 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 Change at high speed
- B Signal early and change smoothly to minimize swing
- C Change in heavy traffic
- D Change quickly without signaling
- A Trust visual inspection only
- B Verify the fifth wheel locks around the kingpin and test by tugging gently
- C Couple at high speed
- D Skip the lock verification
- A Is electrical
- B Prevents accidental release of the hook
- C Is decorative
- D Is the same as a fifth wheel jaw
- A Brakes are uneven
- B All trailers should brake together if the system is functioning correctly
- C Only the first trailer brakes
- D Only the rear trailer brakes
- A All of the above
- B Crosswind effects on the rear trailer
- C Potential rollover at curves
- D Lane changes that swing the rear
- A Tie them in knots
- B Allow them to drag
- C Verify they are crossed under the pintle hook and not dragging
- D Skip the inspection
- A Once a year
- B Never; the dispatcher tests them
- C Only at the destination
- D Before pulling away from the coupling site
- A Air lines from tractor to first trailer to dolly to second trailer
- B No air-brake system
- C Mechanical brakes only
- D Air lines only on the tractor
- A Skip the parking brake
- B Allow the dolly to roll
- C Disconnect at high speed
- D Set the parking brake or chock the wheels before disconnecting
- A Use the trailer hand valve to charge
- B Skip the charge
- C Charge it before coupling and verify pressure
- D Couple without checking
- A Skip the pre-trip
- B Use the trailer hand valve as a parking brake
- C Drive as if it were a single trailer
- D Be aware of the increased complexity of the equipment and operate accordingly
- A Avoid it; if necessary, uncouple to a single trailer first
- B Use only mirrors
- C Have a passenger guide you
- D Back at full speed
- A Crosswind sensitivity
- B All of the above
- C Reduced visibility around the second trailer
- D Increased rollover risk in curves
- A No specific length
- B Tractor length only
- C Trailer length only
- D Total combination length when turning, parking, and changing lanes
- A Plan the turn carefully and use multiple lanes if necessary
- B Turn sharply
- C Maintain speed
- D Skip the planning
- A Are required only on triples
- B Are decorative
- C Provide a backup connection in case the primary coupling fails
- D Carry electrical signals
- A Tractor to second trailer first
- B Trailers first, then tractor
- C Random order
- D Drop first trailer, hook converter dolly to first trailer, back tractor to second trailer, etc.
- A Steer sharply to correct
- B Brake hard
- C Reduce speed gradually and avoid sudden steering inputs
- D Accelerate
- A All of the above
- B Skip the brake-light test
- C Skip the air-leak rate check
- D Skip the parking-brake test
- A A trailer for transporting animals
- B A tractor only
- C A short trailer commonly used in doubles and triples
- D A converter dolly
- A T endorsement allows triples everywhere
- B Restrictions apply only to hazmat
- C Federal and state rules vary; T endorsement does not override route restrictions
- D There are no restrictions
- A Is the same as a tractor fifth wheel
- B Is electrical only
- C Is a single hook
- D Includes a pintle hook on the front and a fifth wheel on the back
- A The right lane on multilane highways when possible
- B Any lane
- C The shoulder
- D The left lane
- A Accelerate
- B Brake hard
- C Steer sharply to correct
- D Reduce speed gradually and avoid sudden steering inputs
- A Leave brakes off
- B Set only the tractor parking brake
- C Use the trailer hand valve
- D Set parking brakes on the tractor and on the trailers
Study tips for the Maryland Doubles / Triples exam
The Doubles / Triples portion of the Maryland CDL exam is graded out of the bank of questions the Maryland Motor Vehicle Administration draws from each year. While the exact bank is not published, every question is sourced from the Doubles / Triples chapter of the Maryland 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 Maryland 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 Maryland Motor Vehicle Administration 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 Maryland 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 Maryland 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 Maryland Motor Vehicle Administration office.
Already comfortable with this endorsement? Drill another: MD General Knowledge · MD Air Brakes · MD Combination Vehicles · MD Hazardous Materials · MD Passenger · MD School Bus · MD Tank Vehicle
New to the CDL process in Maryland? Read How to apply for a CDL in Maryland for the document checklist and step-by-step timeline.