Louisiana's CDL manual and DMV CDL Practice Tests

for all endorsements

Louisiana's CDL Manual

Commercial Driver Handbook

Louisiana CDL Classes When working towards a CDL, it’s crucial to know which class you need. In Louisiana, there are three CDL classes:

  • Class A CDL
  • Class B CDL
  • Class C CDL

Louisiana CDL Endorsements Okay, now that you know what CDL class you need, let’s move on to endorsements. These signify that you acquired specialized knowledge or training regarding your CMV or the load you’re transporting. NOTE: each endorsement has its own set of knowledge exams. In total, there are six endorsements available to Louisiana commercial drivers. However, you can only add three to a CLP (commercial learner’s permit). These include:

  • Passenger (P) Endorsement — Drivers who operate vehicles designed to transport 16 or more passengers, including the driver, need this endorsement. Anyone who wants to drive a bus must apply for it.
  • School bus (S) Endorsement — It’s specifically for applicants who want to drive a school bus, regardless of whether it classifies as Class A, B, or C.
  • Tank (N) Endorsement — It’s for vehicles designed to transport tanks with an individual capacity of 119 gallons, or can accommodate 1,000 gallons or more. These are typically used to transport liquid or gaseous materials.

You can only get the remaining three endorsements after you get your CDL (commercial driver’s license). These are:

  • Double and Triple Trailer (T) Endorsement — For vehicles that pull said units. Typically, drivers operating Class A CMVs need it.
  • Hazardous Materials (H) Endorsement — For vehicles that transport hazardous materials in amounts requiring placarding.
  • Combination Hazardous Materials and Tank (X) Endorsement — For tank vehicles that carry hazardous materials.

Just like any license type, you must comply with some requirements before you’re eligible to apply for a commercial driver’s license.

  • You are at least 18 years old (You must be at least 21 to make out-of-state trips, carry passengers, or move hazardous materials)
  • You have a valid driver’s license and active driving privileges
  • You are compliant with the medical requirements of the Federal Motor Carrier Safety Regulations
  • You are a U.S. Citizen. If not, you must have permission to work in the United States
  • You are a resident of Louisiana
  • You must be able to converse and write comfortably in English

DMV CDL Practice Tests

General Knowledge

The general knowledge test is the first of several tests that you will have to complete in order to get your CDL. The questions cover general information about commercial vehicles, driving, and vehicle inspections. The test has a total of 50 questions, and requires at least 40 correct answers to pass.

Air Brakes

You must have an Air brake endorsement on your driver's license to drive a vehicle equipped with an air brake system. This test will test your knowledge of the function, parts, and braking distance of air brakes. The test will consist of 25 questions, and at least 20 correct answers are needed to pass.


The combination endorsement allows you to drive a vehicle with a power unit and one trailer. This test will cover the "ins and outs" of operating articulated vehicles. The exam consists of 25 questions, and requires at least 20 correct to pass.

Hazardous Material

The Hazardous Material endorsement allows the driver to operate a vehicle containing items such as poisons, explosives, flammables, etc. You will also have to pass the TSA Hazardous Material Threat Assessment to get this endorsement. There are 30 questions, 24 correct required to pass.


The Tanker endorsement allows the driver to operate a vehicle weighing more than 26,000 pounds designed to transport any liquid or gaseous material within a tank that is permanently or temporarily attached to the vehicle. There are 20 questions, 16 correct required to pass.

Doubles / Triples

The Doubles/Triples endorsement is required for drivers to pull 2 trailers (doubles) or 3 trailers (triples) connected to a single power unit. There are 20 questions on this test, and 16 correct answers are required to pass.


Bus drivers must have a commercial driver's license with a passenger endorsement in order to operate a vehicle which seats 16 or more, including the driver. There are 20 questions on this test, and 16 correct answers are required to pass.

School Bus

School Bus Endorsement is required for any driver who operates a school bus. After the permit tests the training can be only completed by a local school district. There are 20 questions on this test, and 16 correct answers are required to pass.

Pre Trip Inspection

The Pre-Trip exam is an oral exam where you are expected to check the vehicle parts to insure it is safe for road use. The amount of parts you need to check increase with the size of the vehicle, and by type of vehicle.