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- Updated for January 2025
- Based on 2025 LA commercial driver's license manual
Free Louisiana CDL Combination Practice Test 2025
There ought to be a lot of work for semi-truck drivers in the great state of Louisiana! Louisiana’s abundance of oil and gas and its refineries and chemical plants have made the state a major hub for the oil and gas industry. Another key economic sector is agriculture, producing seafood, cotton, soybeans, sugarcane, and other products. Both of these economic sectors need truck drivers to transport equipment and materials to them and transport their products. There are also economic opportunities in logistics. The Port of South Louisiana is one of the largest tonnage ports in the Western Hemisphere, creating a demand for truck drivers skilled in intermodal transport.
In Louisiana, major trucking routes include Interstate 10, Interstate 12, Interstate 20, Interstate 49, U.S. Route 90, U.S. Route 61, U.S. Route 90, and Louisiana Highway 1.
To drive commercial motor vehicles (CMVs), you must obtain a Commercial Driver’s License (CDL). The requirements for a CDL include passing a medical exam, passing a knowledge test on the general theory of commercial driving, and passing a skills test on operating a CMV. There are three classes of CDL: Class A, Class B, and Class C. To be allowed to drive heavy combination vehicles such as semi-trucks and tractor-trailers, you must obtain a Class A Commercial Driver’s License (CDL). A Class A CDL allows you to operate combination vehicles with a gross combination weight rating (GCWR) of 26,001 pounds or more, provided the towed vehicle(s) has a gross vehicle weight rating (GVWR) of more than 10,000 pounds. To qualify, you must pass the official Combination Vehicles knowledge test on the theory of operating combination vehicles in addition to all the general CDL requirements.
That’s likely why you’re here. You know you need to pass the Combination Vehicles knowledge test, but you’re concerned that you may not pass it just by reading the official Louisiana Commercial Driver License Manual (Louisiana CDL Handbook 2025). Don’t worry. We have some other tools for you that will help you ace that knowledge test!
This free Louisiana CDL Combination practice test is based on the official state CDL manual, just like the official knowledge test. And it’s up to date as of January, 2025. There are 25 multiple-choice questions and answers on such topics as combination braking systems, combination driving techniques, coupling and uncoupling, and vehicle inspections. Unlike the official knowledge test, however, there’s no time limit, and our automated assistant can help you by providing you with a hint for each question and an explanation of the correct answer.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual LA OMV exam
questions
correct answers to pass
passing score
List of questions (classic view)
- After you lock the kingpin into the fifth wheel, how should you check the connection?
- After you connect the air lines but before you back under the trailer, you should
- Which statement best illustrates the "crack-the-whip" effect?
- When you inspect the landing gear after uncoupling the trailer, where should the tractor be?
- What is the safest way to turn right from a two-way road?
- To drive a triple combination vehicle, you must have
- To prevent a rollover, cargo should be
- Combination vehicles take longer to stop when they are empty than when they are fully loaded, because
- If your vehicle gets stuck on a railroad track, you should
- Low-slung vehicles can be risky at railroad crossings because
- On a double or triple vehicle, which wheels offtrack the most?
- When you're pulling doubles or triples, the shut-off valves should always be
- On a trailer, where is the yellow antilock brake (ABS) malfunction lamp located?
- Even before antilock braking systems (ABS) were required, some vehicles already had them. How can you check if your vehicle has ABS?
- An antilock braking system (ABS) is useful
- After coupling, make sure that the air lines are not crossed. How should you do this?
- During uncoupling, you should disconnect the electrical cable and
- Before you start to uncouple, you must
- You can confirm that air is going to all brakes in your trailers by
- To uncouple a loaded trailer, after the landing gear has made firm contact with the ground, you should
- If the trailer has antilock brakes (ABS) but the tractor doesn't,
- To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and
- If your test of the tractor protection valve is successful,
- The tractor protection valve is designed to close automatically if the air pressure falls into the pressure range specified by the manufacturer, typically
- As part of your vehicle inspection test, if your vehicle is equipped with air brakes and has a trailer, you will inspect the air connections between the truck or tractor and the trailer. Make sure that the ________ are locked in place and free of damage or air leaks.
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