Rhode Island CDL Combination Test (RI) 2026

4.9 out of 5 (37 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Are you preparing for your RI CDL combination test? Our Rhode Island practice permit test is designed to help you succeed in obtaining your Commercial Driver's License (CDL) combination vehicles endorsement. This DMV permit test practice includes a range of multiple-choice questions that cover all the essential areas, such as coupling and uncoupling, pre-trip inspections, driving techniques, backing and maneuvering, and air brake systems. Each CDL combination practice test consists of 20 questions, with a requirement of at least 16 correct answers to pass. Our RI combination CDL practice test is regularly updated to reflect the latest driving laws and regulations, ensuring that you are studying the most current information available. Updated for 2026, our Rhode Island driving test practice offers a reliable way to prepare for the actual test. The multiple-choice format used in our RI CDL combination test mirrors that of the official written permit test, helping you become familiar with the process of eliminating incorrect answers to find the correct one. Understanding the increased stopping distances required for combination vehicles due to their greater weight is critical for maintaining safety on the road. This Rhode Island combination CDL practice test ensures that you can handle the unique challenges presented by these larger, heavier vehicles. By delving into these essential topics, you will be well-prepared to tackle the real test with confidence. To further enhance your preparation, we recommend supplementing the DMV practice test with additional study materials. Utilize the driver's handbook, state-certified driver's ed courses, flashcards, and road sign charts to target all areas of the DMV permit test. This comprehensive approach will help you cover every aspect of the test, giving you a solid foundation of knowledge. Prepare effectively with our RI CDL combination test and ensure that you are ready to meet the demands of driving combination vehicles. By using our up-to-date and thorough practice resources, you'll be equipped with the knowledge and skills necessary to pass your test and drive safely on Rhode Island's roads.
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Sample Rhode Island Combination Test Questions

Question 1

If braking causes the trailer to begin skidding toward a jackknife, what should you do?

  1. A Apply the trailer hand valve firmly
  2. B Accelerate until the trailer straightens
  3. C Make a sharp steering correction
  4. D Release the brakes to restore traction

Correct answer: D – Release the brakes to restore traction

Release the brakes to allow the locked trailer wheels to regain traction. A trailer tends to swing when its wheels lock, especially if it is empty or lightly loaded. Do not apply the trailer hand valve in an attempt to straighten the combination because additional trailer braking can continue or worsen the skid.

Source: Commercial Driver License Manual — § 6.1.5, “Prevent Trailer Skids”.

Question 2

When checking trailer height before coupling, what should happen as the tractor backs under the trailer?

  1. A The trailer should remain completely level and unmoved
  2. B The kingpin should pass above the fifth-wheel jaws
  3. C The landing gear should support the trailer’s full weight
  4. D The tractor should lift the trailer slightly

Correct answer: D – The tractor should lift the trailer slightly

The trailer should be positioned low enough for the tractor to raise it slightly while backing underneath. Rhode Island’s CDL manual directs the driver to adjust the trailer height before completing the coupling. A trailer that is too high may not couple correctly, while one that is too low may be struck and damaged by the tractor.

Source: Commercial Driver License Manual — § 6.4.1, “Coupling Tractor-Semitrailers”.

Question 3

Which braking practice reduces the danger of causing a trailer skid during normal driving?

  1. A Use the foot brake and reserve the trailer hand valve for testing
  2. B Apply only the trailer hand valve
  3. C Alternate sharply between accelerating and braking
  4. D Use the trailer hand valve whenever the trailer is lightly loaded

Correct answer: A – Use the foot brake and reserve the trailer hand valve for testing

The foot brake sends air to the brakes throughout the combination, including the trailer brakes. The CDL manual states that using only the foot brake creates much less danger of a skid or jackknife than using the trailer hand valve. The hand valve should be used to test the trailer brakes, not for normal driving.

Source: Commercial Driver License Manual — § 6.2.1, “Trailer Hand Valve”.

Question 4

On a trailer designed to tow another trailer, where are the air-line shut-off valves located?

  1. A Inside the tractor cab
  2. B At the rear of the tractor
  3. C At the front of the trailer only
  4. D At the rear of the trailer

Correct answer: D – At the rear of the trailer

Shut-off valves, sometimes called cut-out cocks, are installed in the service and supply lines at the rear of trailers used to tow additional trailers. The valves between connected units must be open. The shut-off valves at the rear of the last trailer must be closed when no additional trailer is attached.

Source: Commercial Driver License Manual — § 6.2.7, “Shut-off Valves”.

Question 5

What color coding is commonly used for a combination vehicle’s emergency and service air lines?

  1. A Emergency black; service yellow
  2. B Emergency blue; service red
  3. C Emergency red; service blue
  4. D Emergency green; service white

Correct answer: C – Emergency red; service blue

The emergency line, also called the supply line, is commonly identified by red hoses, couplers, or other components. The service line is identified by blue. This color coding helps prevent crossed air-line connections, but the driver must still connect and test the lines correctly rather than relying on color alone.

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

Question 6

A trailer blocks the interior view behind a regulated truck or truck tractor. Which mirror arrangement is generally required?

  1. A One outside mirror on each side
  2. B One outside mirror on the driver’s side only
  3. C One outside mirror on the passenger’s side only
  4. D No outside mirrors if the trailer has reflective markings

Correct answer: A – One outside mirror on each side

Federal motor-carrier equipment rules generally require a truck or truck tractor to have an outside rear-vision mirror on each side. A limited one-mirror exception applies to certain trucks when an interior mirror provides a rearward view. Because the trailer blocks that view, a commercial vehicle operating in Rhode Island needs mirrors that provide visibility along both sides.

Source: 49 CFR § 393.80(a), (b)(2) – Rear-vision mirrors.

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