South Dakota Doubles / Triples CDL Practice Test
Below are 25 exam-style questions for the South Dakota Doubles / Triples CDL knowledge test, modeled on the FMCSA-aligned content used by the South Dakota Driver Licensing Program. 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 Continue with damaged tires
- B Ignore the damage
- C Replace before operating
- D Use the spare
- A Skip the signal
- B Cut between cars
- C Plan the change well in advance, signal early, and change when there is ample space
- D Change quickly to fit in
- A Air lines, electrical lines, and connection points
- B Fuel tanks
- C Engines
- D Drivers
- A Use the trailer hand valve
- B Leave brakes off
- C Set parking brakes on the tractor and on the trailers
- D Set only the tractor parking brake
- A More opportunities for tire failure and more inspection points
- B Better handling
- C Fewer inspection points
- D No effect on safety
- A It accelerates faster
- B It is shorter
- C Total length and weight increase stopping distance and require more reaction time
- D It uses different brakes
- A All of the above
- B Cargo placement
- C Lane changes
- D Wind, especially crosswinds and from passing trucks
- A Use the trailer hand valve to charge
- B Charge it before coupling and verify pressure
- C Skip the charge
- D Couple without checking
- A Tractor cannot jackknife
- B Rear trailer can swing out and cause loss of control
- C Speed is reduced faster
- D Brakes work better
- A A type of car carrier
- B A train carrying buses
- C A combination with a second trailer that has a kingpin attached to the first trailer
- D A type of bus
- A Change in heavy traffic
- B Change at high speed
- C Change quickly without signaling
- D Signal early and change smoothly to minimize swing
- A Reduce speed gradually and avoid sudden steering inputs
- B Accelerate
- C Steer sharply to correct
- D Brake hard
- A How to inspect each connection point
- B Coupling and uncoupling procedures
- C State and federal route restrictions
- D All of the above
- A Skip the spotter
- B Back at full speed
- C Use only mirrors
- D Avoid backing whenever possible; use a spotter when needed
- A The shoulder
- B The right lane on multilane highways when possible
- C Any lane
- D The left lane
- A Lane changes that swing the rear
- B All of the above
- C Crosswind effects on the rear trailer
- D Potential rollover at curves
- 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 No change in handling
- B It can sway and lift more easily; drive carefully
- C It is harder to roll over
- D Better fuel mileage
- A Better fuel mileage
- B Handling and braking are affected
- C No effect
- D Better handling
- A No off-tracking occurs
- B Use the left lane
- C Off-tracking is more pronounced; swing wider than for a single trailer
- D Off-tracking is less than a single trailer
- A Trailers first, then tractor
- B Random order
- C Drop first trailer, hook converter dolly to first trailer, back tractor to second trailer, etc.
- D Tractor to second trailer first
- A All trailer service brakes simultaneously
- B Only the first trailer brakes
- C Only the rear trailer brakes
- D Tractor and trailer brakes
- A Is less likely to roll
- B Cannot roll
- C Has the same rollover risk
- D Is more likely to roll than the first
- A Allow chains to drag
- B Verify it is properly engaged and safety chains are attached
- C Allow loose engagement
- D Skip the safety chains
- A Federal and state rules vary; T endorsement does not override route restrictions
- B There are no restrictions
- C Restrictions apply only to hazmat
- D T endorsement allows triples everywhere
Study tips for the South Dakota Doubles / Triples exam
The Doubles / Triples portion of the South Dakota CDL exam is graded out of the bank of questions the South Dakota Driver Licensing Program draws from each year. While the exact bank is not published, every question is sourced from the Doubles / Triples chapter of the South Dakota 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 South Dakota 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 South Dakota Driver Licensing Program 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 South Dakota 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 South Dakota 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 South Dakota Driver Licensing Program office.
Already comfortable with this endorsement? Drill another: SD General Knowledge · SD Air Brakes · SD Combination Vehicles · SD Hazardous Materials · SD Passenger · SD School Bus · SD Tank Vehicle
New to the CDL process in South Dakota? Read How to apply for a CDL in South Dakota for the document checklist and step-by-step timeline.