Combination Vehicles Practice Test | New Mexico 2025 #1

Train for FREE online with our New Mexico CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a NM combination license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.

Number of Question 20

Passing Score 16

Number of Tests 20

1 . What is a bobtail tractor?

A tractor without a semi-trailer

A tractor with two semi-trailers

A tractor that travels faster than the speed limit

Tractors without semi-trailers are referred to as "bobtail tractors." Bobtail tractors are difficult to operate and drivers must exercise caution.

2 . If the emergency air line loses pressure:

The Anti-Lock Braking System will activate.

The service air line will activate.

The emergency brakes will activate.

The emergency air line controls the emergency brakes on a combination vehicle. A loss of air pressure in the emergency line will cause the emergency trailer brakes to activate.

3 . What does an Anti-Lock Braking System (ABS) do?

It allows a vehicle's wheels to lock up.

It prevents a vehicle's wheels from locking up.

It makes turning a vehicle easier.

An Anti-Lock Braking System (ABS) helps prevent wheel lockup during hard braking. If ABS detects impending lockup, it reduces braking pressure to a safe level.

4 . When driving while pulling trailers, you should:

Make sudden turns with the steering wheel.

Avoid making sudden moves.

Push the accelerator to the floor when starting from a stop.

You should always steer gently and smoothly while pulling a trailer. Making sudden steering moves could cause the trailer to tip over.

5 . When braking while pulling a trailer equipped with anti-lock brakes, you should:

Pump the brakes.

Use extra braking force to ensure the brakes kick in.

Brake as you would without anti-lock brakes.

When driving a tractor-trailer combination that is equipped with an Anti-Lock Braking System (ABS), you should brake in the same manner that you would if the vehicle was not equipped with ABS.

6 . The trailer hand valve should be used:

To test the trailer brakes.

To check the connection between the trailer and tractor.

To accelerate.

The trailer hand valve (also referred to as the "trolley valve" or "Johnson bar") works the trailer brakes and should be used only when testing them. Using the trailer hand valve while driving could result in a skid.

7 . Combination vehicles:

Are usually shorter than single commercial vehicles.

Usually require less skill to drive than single commercial vehicles.

Usually require more skill to drive than single commercial vehicles.

Driving combination vehicles requires more skill than driving single commercial vehicles. Combinations are generally longer, generally heavier, and are more vulnerable to rollover.

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2025 New Mexico | Frequently Asked Questions

To acquire a CDL Tank endorsement in New Mexico, you need to pass the Tank Vehicle section of the New Mexico CDL test. You must also possess a valid New Mexico commercial driver's license (CDL). Studying the CDL manual and taking practice tests can help prepare you for the examination. Ensure to pay the required fees for testing and endorsement.

To obtain a CDL Tank license, you must hold a valid CDL. You'll need to pass the Tank Vehicle section of your state's CDL exam. Preparation involves studying your state's CDL manual, particularly the sections dedicated to tank vehicles. Also, ensure you meet any physical requirements and pay necessary fees for testing and obtaining the endorsement.

While specific training is not legally required to obtain a CDL Tank endorsement, it's highly recommended. Experience driving similar vehicles can be beneficial. You must pass the Tank Vehicle section of the CDL exam, so studying the CDL manual and taking practice tests will be crucial. Training can help you gain practical skills and knowledge to pass the exam.

Yes, to get a CDL Tank endorsement, you must pass the Tank Vehicle section of the CDL exam. This is an additional written test that covers specific knowledge related to operating tank vehicles, such as handling high center of gravity and inspecting tank vehicles. The test is separate from the general CDL exam and specific to your state's regulations.

The CDL Tank endorsement written test covers specific knowledge related to operating tank vehicles. Topics include: understanding bulk tanks, inspecting tank vehicles, driving tank vehicles (including high center of gravity handling), and safe loading and unloading procedures. The test is designed to ensure drivers can safely operate these types of commercial vehicles.

The CDL Tank endorsement doesn't involve a specific skills or maneuvers assessment. The endorsement is based on a written test only. However, the general CDL skills test, which you must pass prior to any endorsement tests, evaluates your ability to inspect your vehicle, basic control skills, and on-road driving, which would apply to tank vehicles as well.

Drivers with a CDL Tank endorsement must comply with federal and state-specific regulations for transporting hazardous materials. They must ensure the tank's weight does not exceed the vehicle's Gross Vehicle Weight Rating. Also, they must understand how to handle different liquid cargos safely, and know how to respond in case of emergencies or spills.

No, you cannot transport liquid or gas materials without a valid CDL Tank endorsement. The endorsement is required for drivers who operate commercial motor vehicles that are designed to transport any liquid or gaseous materials within a tank or tanks having an individual rated capacity of more than 119 gallons and an aggregate rated capacity of 1,000 gallons or more.

The CDL Tank endorsement can be added to your current CDL license without needing a fresh application. You'll need to pass the Tank Vehicle written test. Once you pass the test, the endorsement will be added to your existing CDL. Remember, fees may apply for adding endorsements.

Yes, specific regulations are in place for handling hazardous materials with a CDL Tank endorsement. In addition to the tank endorsement, you will need a Hazardous Materials (HazMat) endorsement. This requires passing a written test, a TSA background check, and adhering to stringent safety regulations due to the potential risks associated with transporting hazardous materials.