Combination Vehicles Practice Test | Louisiana 2026 #2

Train for FREE online with our Louisiana 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 LA combination license in 2026, 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 . When the wheels of a trailer lock up:

The trailer will be drivable.

The trailer may swing around.

The vehicle will maintain steering.

A trailer may swing out and strike other vehicles if its wheels lock up. This is especially likely with lightly-loaded trailers.

2 . Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:

The trailer will stop normally.

The trailer will not have brakes.

The trailer will speed up.

Older trailers do not have spring brakes. This means that if the air supply in an older trailer's air tank has leaked away, there will be no working brakes connected to the trailer and its wheels will turn freely.

3 . When coupling:

You can assume all vehicles are the same.

Be sure that you are coupling correctly.

Cracks in the mounting are acceptable.

Incorrect coupling and uncoupling of combination vehicles can have extremely dangerous consequences.

4 . When driving with trailers, you should:

Make quick, sudden changes.

Avoid making sudden moves.

Accelerate by pushing the accelerator to the floor.

To reduce the risk of tipping over when driving with a trailer, you should steer gently and smoothly. Avoid making sudden movements.

5 . When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.

The Anti-Lock Braking System

The emergency braking system

The trailer service brakes

To test the trailer service brakes, you should first ensure that the braking system has a normal air pressure level, then release the parking brake. You should then move the vehicle forward slowly and apply the brakes with the hand control. If the trailer service brakes are working properly, you will feel the brakes activate.

6 . The trailer hand valve:

Should always be used for parking.

Should only be used for parking on a downgrade.

Should never be used for parking.

Never use the trailer hand valve while parking because doing so may release the air pressure from the braking system, releasing the brakes that are holding the vehicle in place. Instead, use the parking brake or wheel chocks.

7 . Having anti-lock brakes on only one axle:

Will not make a difference in braking.

Will provide increased control in braking.

Will likely cause the air brakes to malfunction.

If a vehicle has anti-lock brakes on just one axle, the driver will still have more control during braking than they would without any anti-lock brakes.

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2026 Louisiana | Frequently Asked Questions

To secure a CDL Doubles/Triples endorsement in Louisiana, you must first have a valid CDL. Then, study the Doubles and Triples section of the Louisiana CDL manual to prepare for the written knowledge test. Visit a DMV office to take and pass this test. There's no skills test required for this endorsement, only the written knowledge test.

To obtain a CDL Doubles/Triples license, you must already have a valid Commercial Driver's License (CDL). You'll need to study the Doubles and Triples section of your state's CDL manual, then pass a written knowledge test at your local DMV. No additional skills test is required for this endorsement, only the written examination.

No specialized experience or training is legally required for a CDL Doubles/Triples endorsement. However, you must have a valid Commercial Driver's License (CDL). You will need to study the Doubles and Triples section of your state's CDL manual and pass a written knowledge test. Practical training, though not mandatory, could be beneficial for handling these larger vehicles.

Yes, an additional written knowledge test is mandatory for the CDL Doubles/Triples endorsement. You'll need to study the Doubles and Triples section of your state's CDL manual. The written test covers topics like coupling and uncoupling, inspecting doubles and triples, and pulling double/triple trailers. No additional skills test is required for this endorsement.

The CDL Doubles/Triples endorsement does not require a specific skills or maneuvers test. However, the written knowledge test includes topics such as coupling and uncoupling, inspecting doubles and triples, and pulling double/triple trailers. It's important to thoroughly understand these concepts. Practical skills may be beneficial, but they are not formally assessed for this endorsement.

No, it is not permissible to operate double/triple trailers without a valid CDL Doubles/Triples endorsement in Louisiana. This endorsement is required by law to ensure the driver has the necessary skills and knowledge to safely operate such vehicles. Failure to obtain the proper endorsement can result in legal penalties, including fines and suspension of your CDL.

You can add the CDL Doubles/Triples endorsement to your existing Commercial Driver's License. You don't need to initiate a new application for a separate license. However, you must pass the Doubles/Triples endorsement knowledge test. Once you pass, the endorsement will be added to your current CDL.

Yes, there are limitations for drivers with a CDL Doubles/Triples endorsement. These include restrictions on the overall length of the vehicles, the weight of the trailers, and where these vehicles can be driven. Additionally, drivers must comply with hours-of-service regulations to prevent fatigue. Violation of these limitations can result in legal penalties and endanger public safety.

In Louisiana, the maximum legal weight for a vehicle is 80,000 pounds. The maximum length for a double trailer is 81 feet 6 inches, while triple trailers are not allowed. However, these restrictions can be subject to change depending on the specific roadway and bridge limits. Always check local regulations before driving.

Yes, there are specific safety guidelines. Drivers must ensure proper coupling and uncoupling of trailers, and make sure the weight is evenly distributed. They must also maintain safe following distances, use extra caution in adverse weather conditions, and be aware of the high rollover risk due to the higher center of gravity. Regular vehicle inspections are also required.