Vermont CDL Combination Practice Test (VT) 2

4.9 out of 5 (37 votes)
80% Passing score
20 Questions
4 Mistakes allowed
As a Vermonter preparing for your Commercial Driver's License (CDL), you'll find this VT CDL combination test an invaluable resource. This DMV practice test is designed with 20 carefully crafted multiple-choice questions that cover essential topics such as inspection procedures, safe driving practices, air brake systems, and more. To pass, you need to correctly answer at least 16 of the questions. The varied questions on this Vermont permit practice test not only boost your confidence but also ensure you are thoroughly prepared for the actual permit test. One unique aspect of this learner's permit practice test is its regular updates. Our Vermont permit test practice is meticulously maintained to reflect the latest driving laws and regulations, ensuring that you are studying the most current information. As of 2026, the content remains up-to-date, giving you peace of mind that your preparation is both relevant and comprehensive. Visual learning aids are an integral part of this VT practice permit test. Many questions include images to help clarify the scenarios, making it easier for visual learners to understand the content. This feature is particularly beneficial for grasping complex concepts and situational questions. The Vermont combination vehicle test mirrors the format of the actual written permit test by using multiple-choice and true or false questions. This familiarizes you with the process of eliminating incorrect answers, enhancing your test-taking skills and increasing your chances of success. Driving conditions in Vermont can vary significantly, from the icy roads of the Northeast Kingdom to the winding, hilly routes in the Green Mountains. This combination CDL practice test addresses these unique challenges, such as understanding the risks of jackknifing. Mastering smooth braking and careful handling is crucial for navigating VT's diverse road conditions safely. Utilize this Vermont CDL combination test to hone your skills and knowledge, ensuring you're well-prepared for the road ahead. Whether you're navigating the scenic routes of the Champlain Valley or tackling the steep grades of Route 9, this Vermont combination vehicle test will equip you with the confidence and expertise needed for a successful driving career.
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Sample Vermont Combination Test Questions

Question 1

When is it proper to use the trailer hand valve as the parking control for a combination vehicle?

  1. A When parked on a grade
  2. B When stopped at a loading dock
  3. C When temperatures are below freezing
  4. D Never

Correct answer: D – Never

Never use the trailer hand valve for parking. On a trailer without spring brakes, lost air pressure can release brakes applied through the hand valve. Use the vehicle’s parking brakes instead, and chock the wheels when parking a trailer that does not have spring brakes.

Source: Vermont Commercial Driver’s License Manual — § 6.2.1, “Trailer Hand Valve”

Question 2

Why must extra care be used when stopping a bobtail tractor?

  1. A It cannot be steered accurately
  2. B It can be difficult to stop smoothly and may require more stopping distance
  3. C It consumes substantially more fuel
  4. D It always has a higher center of gravity than a loaded combination

Correct answer: B – It can be difficult to stop smoothly and may require more stopping distance

A bobtail is a tractor operated without a semitrailer. Testing cited in the CDL manual shows that bobtail tractors can be difficult to stop smoothly and take longer to stop than a tractor-semitrailer loaded to its maximum gross weight. Drivers should leave ample following distance and look ahead so they can brake early.

Source: Vermont Commercial Driver’s License Manual — § 6.1.3, “Brake Early”

Question 3

Before driving after coupling, what condition must be verified at the glad-hand connections?

  1. A The couplers may be damaged if they still lock together
  2. B The connections and air lines are properly secured, free from damage, and not leaking
  3. C Temporary tape has been wrapped around each seal
  4. D The trailer hand valve remains fully applied

Correct answer: B – The connections and air lines are properly secured, free from damage, and not leaking

Glad hands connect the tractor’s service and emergency air lines to the trailer. Their rubber seals help prevent air from escaping, and the couplers and seals should be checked before connection. During the combination-vehicle inspection, the air lines must be properly connected, free from damage, and without air leaks.

Source: Vermont Commercial Driver’s License Manual — § 6.2.5, “Hose Couplers (Glad Hands)”; § 6.5.1, “Additional Things to Check during a Walk-around Inspection”

Question 4

Which trailer air line both charges the trailer tanks and causes the emergency brakes to apply if line pressure is lost?

  1. A The service line
  2. B The ABS electrical line
  3. C The emergency, or supply, line
  4. D The parking-control cable

Correct answer: C – The emergency, or supply, line

The emergency line, also called the supply line, carries air to the trailer air tanks. It also controls the trailer emergency brakes. If pressure is lost because of a broken hose, major leak, or trailer separation, the emergency brakes apply and the tractor protection valve closes.

Source: Vermont Commercial Driver’s License Manual — § 6.2.4, “Trailer Air-lines”

Question 5

Which combination is especially likely to become stuck on a raised railroad-highway crossing?

  1. A Only tank trailers and dump trailers
  2. B Any trailer carrying hazardous materials
  3. C A low-slung trailer or a long trailer pulled by a single-axle tractor with landing gear set for a tandem-axle tractor
  4. D Only an empty standard van trailer

Correct answer: C – A low-slung trailer or a long trailer pulled by a single-axle tractor with landing gear set for a tandem-axle tractor

Raised crossings can trap equipment with low underneath clearance. Examples include lowboys, car carriers, moving vans, and possum-belly livestock trailers. A long trailer pulled by a single-axle tractor can also become stuck when its landing gear is positioned to provide clearance for a tandem-axle tractor.

Source: Vermont Commercial Driver’s License Manual — § 6.1.4, “Railroad-highway Crossings”

Question 6

How should a combination vehicle be driven through turns to reduce rollover risk?

  1. A Slowly, with gentle and smooth steering
  2. B By accelerating through each turn
  3. C With quick, sharp steering corrections
  4. D By applying the trailer hand valve

Correct answer: A – Slowly, with gentle and smooth steering

Enter turns at a safe, reduced speed and steer gently and smoothly. Rollovers commonly occur when a combination vehicle turns too fast, while sudden steering can amplify movement toward the rear of the combination. Keeping cargo low and centered also reduces the likelihood of a rollover.

Source: Vermont Commercial Driver’s License Manual — § 6.1.1, “Rollover Risks”; § 6.1.2, “Steer Gently”

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