New Mexico CDL Combination Practice Test (NM) 2

5 out of 5 (35 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Preparing for your CDL test has never been easier with our NM DMV practice test, specifically designed to help you ace the combination vehicle section. This second practice test offers 20 multiple-choice questions covering crucial topics such as inspection procedures, safe driving practices, air brake systems, and more. To pass, you'll need to answer at least 16 questions correctly, ensuring you have a solid grasp of the material. Our New Mexico CDL combination test stands out by being regularly updated to reflect the latest driving laws and regulations, so you're always studying the most current information. For 2026, we've incorporated the latest changes to ensure your preparation is top-notch. The test mirrors the format of the actual written permit test, using multiple-choice and true or false questions. This familiar format helps you practice eliminating incorrect answers to find the right one, boosting your test-taking confidence. One of the critical areas covered in our New Mexico drivers license practice test is the risk of jackknifing, a hazardous situation where the trailer swings out of alignment with the tractor. You'll learn how to avoid this through smooth braking and careful handling, skills that are essential for safe driving on NM's diverse roads. Speaking of New Mexico, our state presents unique driving conditions that every commercial driver should be aware of. From the winding mountain roads in the northern regions to the vast, open desert highways in the south, drivers must be prepared for a variety of environments. The New Mexico combination vehicle test ensures you're ready for these challenges, with questions tailored to these specific conditions. And the best part? This comprehensive learner's permit practice test is completely free. While other tests may charge hefty fees, our NM CDL combination practice test offers the same high-quality preparation without any cost. You're getting a valuable resource that equips you with the knowledge and confidence needed to pass your CDL permit test. Take advantage of this free, reliable, and up-to-date New Mexico practice permit test today, and set yourself on the path to becoming a skilled and knowledgeable commercial driver.
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Sample New Mexico Combination Test Questions

Question 1

Which uncoupling action can damage a semitrailer’s landing gear?

  1. A Backing with the tractor aligned to the trailer
  2. B Easing pressure from the fifth-wheel locking jaws
  3. C Pulling the tractor out at an angle
  4. D Securing the trailer brakes before uncoupling

Correct answer: C – Pulling the tractor out at an angle

The New Mexico CDL manual instructs drivers to align the tractor with the trailer before uncoupling. Pulling out at an angle can place damaging sideways force on the landing gear. Before separating the units, also confirm that the parking surface can support the trailer and that the trailer brakes are secured.

Source: New Mexico Commercial Driver’s License Manual — § 6.4.2, “Uncoupling Tractor-Semitrailers”

Question 2

After supplying air to a trailer, how should you check for crossed air lines and proper trailer-brake operation?

  1. A Lift the brake pedal and watch the dashboard lights
  2. B Apply and release the trailer brakes while listening for their operation
  3. C Release the tractor brakes and roll the vehicle backward
  4. D Operate only the tractor parking brake

Correct answer: B – Apply and release the trailer brakes while listening for their operation

After air pressure reaches normal, shut off the engine so brake operation can be heard clearly. Apply and release the trailer brakes, listening for the brakes to move when applied and for air to escape when released. Also watch the pressure gauge for signs of a major air loss before continuing the coupling process.

Source: New Mexico Commercial Driver’s License Manual — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 3

A fully loaded combination rig is about ten times more likely to roll over in a crash than an empty rig.

  1. A TRUE
  2. B FALSE

Correct answer: A – TRUE

The New Mexico CDL manual states that fully loaded rigs are ten times more likely to roll over in a crash than empty rigs. Cargo piled higher raises the vehicle’s center of gravity, making the rig easier to overturn. Keep cargo low and centered, and reduce speed before entering corners, ramps, and other turns.

Source: New Mexico Commercial Driver’s License Manual — § 6.1.1, “Rollover Risks”

Question 4

Which statement is correct about air-braked trailers and converter dollies built before 1975?

  1. A They are not required to have spring brakes
  2. B They must have modern antilock brakes
  3. C They cannot use stored air for emergency braking
  4. D They are prohibited from being coupled to newer tractors

Correct answer: A – They are not required to have spring brakes

Federal brake rules distinguish trailers manufactured before January 1, 1975, from newer trailers subject to later emergency-brake standards. The New Mexico CDL manual explains that pre-1975 trailers and converter dollies are not required to have spring brakes. Older units without them use stored air for emergency braking and must be chocked when parked because they have no spring parking brake.

Source: New Mexico Commercial Driver’s License Manual — § 6.2.8, “Trailer Service, Parking and Emergency Brakes”, 49 CFR § 393.40(d)(2)–(3) — Required brake systems

Question 5

In the manual’s rearward-amplification chart, a three-axle tractor-semitrailer with a 27-foot trailer has less rearward amplification than a five-axle tractor-semitrailer with a 45-foot trailer.

  1. A TRUE
  2. B FALSE

Correct answer: B – FALSE

The statement is false. The chart shows greater rearward amplification for the three-axle combination with the shorter trailer than for the five-axle combination with the 45-foot trailer. Greater rearward amplification produces a stronger crack-the-whip effect and increases the chance that the rear of the combination will overturn during a sudden maneuver.

Source: New Mexico Commercial Driver’s License Manual — § 6.1.2, “Steer Gently,” Figure 6.1

Question 6

How should the tractor be positioned before you begin backing under a semitrailer?

  1. A Slightly toward the passenger side of the trailer
  2. B With the kingpin aimed at the driver-side locking jaw
  3. C At an angle of approximately 20 degrees
  4. D Directly in front of and aligned with the trailer

Correct answer: D – Directly in front of and aligned with the trailer

Position the tractor directly in front of the trailer and check alignment by looking down both sides in the mirrors. Backing under the trailer at an angle can push the trailer sideways and damage or break the landing gear. Back slowly and stop when the fifth wheel first touches the trailer before completing the remaining coupling steps.

Source: New Mexico Commercial Driver’s License Manual — § 6.4.1, “Coupling Tractor-Semitrailers”

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