Louisiana CDL Class B Practice Test (LA) 3

4.9 out of 5 (51 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Are you aiming to ace the Louisiana CDL Class B general knowledge test? Look no further! Our third Louisiana CDL practice test is tailor-made to boost your confidence and knowledge. With 20 meticulously crafted questions, this test is your perfect study companion. The best part? You only need to correctly answer 16 to pass. Designed specifically for Class B CDL applicants, this practice test is a comprehensive tool that delves into crucial topics you'll encounter on the real exam. Our Louisiana CDL class B practice test covers a wide spectrum, from pre-trip vehicle inspection to mastering the art of gear shifting, including downshifting. But that's not all - you'll also get to navigate through scenarios involving hills, steep downgrades, and learn the essentials of communicating effectively with fellow road users. Additionally, we've included critical aspects like speed control and drug and alcohol awareness, vital for any responsible driver. We understand the value of up-to-date content. That's why our Louisiana CDL practice test is regularly refreshed with the latest 2026 driving laws and regulations, ensuring you're getting the most current information possible. This attention to detail ensures that when you sit for your Louisiana DMV permit test, you'll be well-versed in the latest rules and best practices. Unlike the tension-filled atmosphere of the actual general knowledge written test, our CDL practice test offers a relaxed, no-pressure environment. It's an ideal setting for learning and mastering the material at your own pace. And remember, each time you take our Louisiana DMV practice test for class B license, you'll face the same set of questions. This consistency is key in reinforcing your knowledge and preparing you thoroughly for the exam day. So why wait? Start practicing now and move one step closer to achieving your CDL Class B license in 2026. Good luck!
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Sample Louisiana CDL Test Questions - General Knowledge

Question 1

Subject to applicable hazardous-material restrictions, which items may a passenger-carrying vehicle transport?

  1. A Small-arms ammunition
  2. B Emergency shipments of drugs, chemicals, and hospital supplies
  3. C Limited quantities of certain other hazardous materials when no practical alternative exists and all conditions are met
  4. D All of the above

Correct answer: D – All of the above

Federal hazardous-materials rules permit small-arms ammunition and emergency shipments of drugs, chemicals, and hospital supplies on passenger-carrying vehicles. Certain other materials may be carried only when no practical alternative is available and the quantity, location, and other restrictions are satisfied. Most hazardous materials remain prohibited on buses carrying passengers.

Source: Louisiana Commercial Driver License Manual — § 4.2.2, “Forbidden Hazardous Materials”, 49 CFR § 177.870(b)–(f) — Regulations for Passenger Carrying Vehicles

Question 2

When fighting an engine-compartment fire, should you fully open the hood to reach the flames?

  1. A True
  2. B False

Correct answer: B – False

Turn off the engine as soon as possible, but avoid opening the hood. Opening it can admit oxygen and cause the fire to flare. If it can be done safely, direct the extinguisher through the radiator, hood louvers, or from beneath the vehicle.

Source: Louisiana Commercial Driver License Manual — § 2.21.3, “Fire Fighting”

Question 3

Which preparation helps prevent distractions once the vehicle is moving?

  1. A Beginning the trip immediately after a heavy meal
  2. B Depending on caffeine to maintain attention
  3. C Learning the controls and adjusting mirrors, navigation, and other equipment before departure
  4. D Keeping a phone ready for reading and sending messages

Correct answer: C – Learning the controls and adjusting mirrors, navigation, and other equipment before departure

Before driving, become familiar with the vehicle's equipment, adjust mirrors and controls, plan the route, and secure loose objects. These steps reduce the need to reach, read, or make adjustments while moving. Federal rules prohibit a commercial driver from manually entering or reading text messages while driving.

Source: Louisiana Commercial Driver License Manual — § 2.9, “Distracted Driving”, 49 CFR § 392.80 — Prohibition Against Texting

Question 4

In Louisiana, what does a parking sign displaying the International Symbol of Accessibility identify?

This sign indicates ___________.
  1. A A space reserved for authorized vehicles serving persons with mobility impairments
  2. B An area where all parking is prohibited
  3. C A general parking space open to any vehicle
  4. D A short-term commercial loading space

Correct answer: A – A space reserved for authorized vehicles serving persons with mobility impairments

The symbol marks an accessible parking space reserved for qualifying vehicles displaying an authorized license plate, hang tag, or parking card. Other vehicles may not use the space. Access aisles adjacent to these spaces must also remain clear so occupants can enter and exit safely.

Source: La. R.S. 40:1742(A)(1), (4), (B)(1) — Parking Spaces for Certain Persons with Disabilities

Question 5

After safely stopping a vehicle that is leaking hazardous material, what should the driver do?

  1. A Park the vehicle and avoid moving it more than safety requires
  2. B Secure the area and keep people away
  3. C Remain at the scene and call or send someone for help
  4. D All of the above

Correct answer: D – All of the above

Do not continue driving merely to locate help, because that can spread contamination. Park when it is safe, secure the area, keep people away, and remain at the scene. Call for assistance or send someone who can provide the location, emergency details, carrier information, and hazardous-material information from the shipping papers.

Source: Louisiana Commercial Driver License Manual — § 9.7, “Hazardous Materials—Emergencies”

Question 6

May a CDL driver operate a commercial vehicle if a prescription or over-the-counter drug makes driving unsafe?

  1. A Yes, whenever the drug was prescribed by a doctor
  2. B No, operating while impaired by the drug is prohibited
  3. C Yes, if the product is sold as cold or diet medicine
  4. D Yes, if the drug is combined with only a small amount of alcohol

Correct answer: B – No, operating while impaired by the drug is prohibited

A Louisiana CDL driver may not operate while using a drug or substance that makes safe driving impossible. A prescription does not automatically make operation permissible. The medical exception applies only when a licensed medical practitioner advises that the substance will not affect the driver's ability to operate safely.

Source: Louisiana Commercial Driver License Manual — § 2.22.3, “Other Drugs”, 49 CFR § 392.4(a), (c) — Drugs and Other Substances

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