Louisiana CDL practice test

Getting a commercial driver's licence in Louisiana starts with the CDL knowledge tests. The content is federal: every state, Louisiana included, writes its tests from the FMCSA CDL manual, so the general knowledge test has 50 questions, the endorsement tests have 20 to 30, and the passing score is 80% on each. The Louisiana driver licensing agency administers the test; the rules behind it are published by the FMCSA. Try the free Louisiana CDL practice questions below, then pick a full test.

50general knowledge questions
80%passing score on every test
8knowledge tests covered
LApick your state once in the app

Free Louisiana CDL practice questions

Five questions from the general knowledge, air brakes and combination vehicles banks, the three tests most Louisiana Class A applicants take first. Show the answer to read the explanation.

What is the best advice for driving in heavy fog?
- Use your high beams so you can see farther
- Follow the taillights of the vehicle ahead closely
- Do not drive; pull into a safe parking area and wait for the fog to lift
- Drive at normal speed but use the flashers
Show answer
Answer: C. Do not drive; pull into a safe parking area and wait for the fog to lift
Fog can be so thick you cannot see hazards in time. If you must drive, slow down, use low beams and fog lights, be ready to stop, and never try to pass.
Source: FMCSA CDL Manual, Section 2.12 (Driving in Fog)
Before driving in winter weather, why should you check that the radiator shutters and winterfront are not blocked with ice?
- Ice on the shutters makes the headlights dim
- Blocked shutters cause the brakes to lock
- Ice adds too much weight to the front axle
- Blocked shutters or a closed winterfront can cause the engine to overheat
Show answer
Answer: D. Blocked shutters or a closed winterfront can cause the engine to overheat
The shutters and winterfront control air flow to the radiator. If ice holds them closed, the engine cannot shed heat and can overheat even in cold weather.
Source: FMCSA CDL Manual, Section 2.13.1 (Vehicle Checks for Winter Driving)
On slippery roads, how should you turn and brake?
- As gently as possible
- Quickly, so the tires grip before they slide
- Only with the parking brake
- With the retarder on for extra braking
Show answer
Answer: A. As gently as possible
Sudden steering or braking on a slick surface breaks traction. Start gently, turn gently, brake gently, and leave extra space so you do not need to do anything suddenly.
Source: FMCSA CDL Manual, Section 2.13.2 (Driving on Slippery Surfaces)
Before driving through deep water or a flooded area, you should:
- Speed up to get through quickly
- Slow down, shift into a low gear, and keep light pressure on the brakes while crossing
- Shift to neutral and coast
- Turn off the engine to keep water out of it
Show answer
Answer: B. Slow down, shift into a low gear, and keep light pressure on the brakes while crossing
Driving slowly in low gear with light brake pressure keeps water from soaking the brake linings so badly. Once across, keep light pressure on for a short distance to heat and dry the brakes.
Source: FMCSA CDL Manual, Section 2.13.3 (Wet Brakes)
After driving through water, how do you dry out wet brakes?
- Stop and let the vehicle sit for an hour
- Drive at highway speed so the wind dries them
- Drive slowly in low gear with light pressure on the brake pedal for a short distance
- Pump the brakes hard at a stop
Show answer
Answer: C. Drive slowly in low gear with light pressure on the brake pedal for a short distance
Wet brakes can be weak, grab, or pull to one side. Gentle brake pressure while moving slowly makes enough heat to dry the linings. Make sure nobody is close behind before you do this.
Source: FMCSA CDL Manual, Section 2.13.3 (Wet Brakes)

Every CDL test for Louisiana drivers

Each page has ten free sample questions, the real question count, the 80% pass mark and what the test covers.

How the Louisiana CDL knowledge test works

You take the general knowledge test first; it is required for every CDL class. Class A drivers add the combination vehicles test. Almost everyone takes the air brakes test, because skipping it puts an air brake restriction on the licence. Endorsements (hazmat, tanker, doubles/triples, passenger, school bus) each have their own knowledge test. Pass the tests and you hold a commercial learner's permit; the skills test in a truck comes later.

Fees, appointment rules and test centre locations are set by Louisiana and change over time, so check the state driver licensing agency before you go. What does not change is the content, and that is what PassRig drills.

Louisiana CDL test questions

How many questions are on the Louisiana CDL test?

The Louisiana CDL general knowledge test follows the federal model: 50 questions, 40 correct to pass. Endorsement tests are shorter: air brakes 25, hazmat 30, and combination vehicles, tanker, doubles/triples, passenger and school bus 20 each.

What is the passing score on the Louisiana CDL permit test?

80% on every knowledge test, the same pass mark used across the United States.

Where do I take the CDL knowledge test in Louisiana?

At the Louisiana state driver licensing agency (the DMV, DOT or equivalent). Check its website for locations, appointments and current fees; the test content itself comes from the FMCSA CDL manual.

Does PassRig have Louisiana CDL practice questions?

Yes. Pick Louisiana in the app and you get practice sets and mock exams built from the knowledge test content your state uses, with the real counts and the 80% line.