Free Tennessee CDL Practice Tests 2026

• Test Format: Computer or paper at Tennessee Driver Service Centers
• General Knowledge Test: 50 questions, 80% to pass
• Permit Validity: 365 days
• Waiting Period: 14 days between CLP issuance and skills test
• Languages: English only
• Fees: $70 for Class A, $62 for Class B/C (8 years)
• Endorsement Fees: $2.50 for most endorsements, $20 for School Bus
• Retesting: Next business day

The Tennessee CDL knowledge test is a test of your knowledge of commercial driving regulations and safety procedures. You must take this test to get a Commercial Learner's Permit (CLP) which you must have before you can take the skills test for a full Commercial Driver's License. The test tests your knowledge of commercial vehicle operations, safety protocols, traffic regulations and driving procedures. Tennessee Driver Service Centers administer the test on computer or paper. Questions cover federal requirements and Tennessee state requirements so you will be prepared to drive commercial vehicles in Tennessee and possibly across state lines.

You need to take the CDL knowledge test in Tennessee if you:

• Are applying for your first Commercial Learner's Permit
• Are adding a new endorsement to your existing CDL
• Are upgrading your CDL classification (e.g. from Class B to Class A)
• Are reinstating a CDL that has been expired over a year
• Are transferring a CDL from another state and adding new endorsements

All applicants must take the General Knowledge test. Depending on your commercial driving goals you may need to take additional tests for specific endorsements such as Passenger (P), School Bus (S), Tank Vehicles (N), Hazardous Materials (H), or Doubles/Triples (T). Each endorsement test covers the specific knowledge required for that vehicle or cargo type.

The CDL knowledge test is a safety net to make sure commercial drivers have the knowledge to operate big vehicles safely. It tests your knowledge of regulations, safety protocols, technical operations and emergency procedures. This test helps to keep high safety standards and reduce accidents on Tennessee roads. Commercial vehicles can cause a lot of damage in an accident because of their size and weight, so proper knowledge and training is required before operating these vehicles. The knowledge test is the first step to showing you are ready for the responsibility of commercial driving in Tennessee.

The Tennessee CDL knowledge test uses Federal Motor Carrier Safety Administration standards and Tennessee state requirements. This way you are consistent with national commercial driver qualifications and state specific requirements. Test content covers general driving skills, air brake systems, combination vehicles and specialized endorsements. Your Tennessee CDL will be recognized throughout the United States as long as you meet the age requirements and other interstate commerce qualifications. Tennessee's testing process makes sure you are ready for in-state and interstate commercial driving.

Tennessee CDL knowledge tests have varying number of questions:

• General Knowledge: 50 questions
• Air Brakes: 25 questions
• Combination Vehicles: 20 questions
• Passenger Endorsement: 20 questions
• School Bus Endorsement: 20 questions
• Hazardous Materials Endorsement: 30 questions
• Tank Vehicles Endorsement: 20 questions
• Doubles/Triples Endorsement: 20 questions

All tests are multiple choice with 4 possible answers per question. These tests thoroughly test your knowledge of safety protocols, regulations and technical knowledge required to operate commercial vehicles in Tennessee.

Sample question: When inspecting fifth wheel connections, you should check that:

• The fifth wheel is at an upward angle
• There is no space between upper and lower fifth wheel components
• The kingpin shows some flexibility when pressure is applied
• The fifth wheel plate sits on top of the trailer apron

Answer: B. There is no space between upper and lower fifth wheel components

To pass any Tennessee CDL knowledge test you must answer at least 80% of the questions correctly:

• General Knowledge: 40 out of 50 correct
• Air Brakes: 20 out of 25 correct
• Combination Vehicles: 16 out of 20 correct
• Passenger Endorsement: 16 out of 20 correct
• School Bus Endorsement: 16 out of 20 correct
• Hazardous Materials Endorsement: 24 out of 30 correct
• Tank Vehicles Endorsement: 16 out of 20 correct
• Doubles/Triples Endorsement: 16 out of 20 correct

Each test is scored separately so if you pass some tests but fail others you will only need to retake the tests you didn't pass.

Tennessee CDL knowledge tests are in English only. Federal regulations require commercial drivers to read and speak English sufficiently to understand traffic signs, communicate with officials, complete required documentation and understand shipping papers. This English proficiency requirement ensures commercial drivers can navigate roadways safely, communicate with law enforcement and emergency services and properly handle required documentation. The Tennessee Department of Safety & Homeland Security does not provide exceptions to this language requirement for CDL testing.

No. Tennessee prohibits the use of study materials, electronic devices, reference materials or calculators during CDL knowledge tests. Testing areas are monitored and using prohibited materials will result in test failure. All personal belongings must be stored in a designated area during testing including:

• Mobile phones and electronic devices
• Study notes or reference sheets
• Tennessee CDL manuals
• Reference materials of any kind
• Calculators (unless specifically permitted for certain questions)

Using prohibited materials during testing may result in immediate disqualification and could affect your eligibility for future testing opportunities in Tennessee.

Tennessee doesn't have time limits for CDL knowledge tests but most applicants complete the General Knowledge test in 60-90 minutes. Endorsement tests typically take 20-30 minutes each. Plan accordingly if you are taking multiple tests in one visit. The Tennessee Department of Safety provides enough time to complete the tests without rushing. If you have documented learning disabilities or other special needs you may request accommodations by contacting the Department of Safety prior to your test date with appropriate documentation.

Tennessee has several CDL knowledge tests depending on your license class and endorsement needs:

• General Knowledge – Required for all CDL applicants. Covers basic driving and safety rules.
• Air Brakes – Needed to drive vehicles with air brake systems.
• Combination Vehicles – Required for Class A vehicles like tractor-trailers.
• Passenger (P) – Needed to drive buses or vehicles carrying passengers.
• School Bus (S) – Required to drive a school bus.
• Doubles/Triples (T) – Needed to pull double or triple trailers.
• Tank Vehicles (N) – Required to haul liquid or gas in a tank.
• Hazardous Materials (H) – Needed to transport hazardous materials.

Each test covers specific information related to that particular type of vehicle or operation. You only need to take the tests that apply to the type of commercial driving you will be doing.

Sample question: What occurs during "brake lag" in air brake systems?

• Time for brake components to wear out
• Time for air to flow through lines after brake pedal application
• Time to shift your foot from accelerator to brake pedal
• Time to fully engage the parking brake

Answer: B. Time for air to flow through lines after brake pedal application

The General Knowledge test covers vehicle inspection, basic control techniques, shifting gears, space management, night driving, adverse weather driving, emergency procedures, cargo handling, accident protocols, fire prevention, fatigue awareness and basic hazardous materials regulations.

The Air Brakes test covers system components and functions, dual air brake systems, inspection procedures, operation in various conditions, emergency stopping, system failure and brake lag/fade.

The Combination Vehicles test covers coupling and uncoupling, inspection points, handling characteristics, rollover prevention, jackknife avoidance, turning and backing for combination vehicles.

The Passenger Endorsement test covers passenger loading and unloading, emergency exit operations, passenger communication, accessibility requirements, disruptive passenger management and railroad crossing for passenger vehicles.

The School Bus Endorsement test covers student loading and unloading, emergency evacuation, operations around schools, railroad crossing, student management, danger zones and special equipment.

The Doubles/Triples Endorsement test covers coupling and uncoupling multiple trailers, handling characteristics, inspection procedures, identifying and correcting handling problems and operating in challenging conditions.

The Tank Vehicle Endorsement test covers liquid surge, weight distribution and handling, baffled vs non-baffled tank differences, loading/unloading and specialized braking for partially filled tanks.

Hazardous Materials Endorsement test covers classification and identification of hazardous materials, documentation requirements, loading/unloading procedures, driving regulations, emergency response and security awareness.

To prepare for your Tennessee CDL knowledge test:

• Study relevant sections of the Tennessee CDL Manual based on your license class and endorsements
• Take practice tests to find knowledge gaps and build confidence
• Create a study schedule over several weeks rather than cramming
• Make flashcards for technical concepts and terminology
• Spend extra time on air brakes and hazardous materials
• Master pre-trip inspection procedures through repeated review
• Pay attention to Tennessee specific regulations and requirements
• Study vehicle systems until you understand how components work together
• Familiarize yourself with all required documentation and procedures

Most successful candidates prepare consistently over time rather than last minute cramming. Many applicants underestimate the technical knowledge required especially for endorsements.

Yes! Our free Tennessee practice tests are available to help you:

• Identify areas where you need improvement
• Build confidence through consistent practice
• Get used to the test format before your actual exam
• Track your progress as you study
• Understand explanations for correct and incorrect answers
• Familiarize yourself with question types similar to the actual test

These practice tests cover all CDL test categories and are updated regularly to reflect current testing standards. Studies show that using practice tests increases first-attempt pass rates on the Tennessee CDL knowledge tests.

To pass the Tennessee CDL knowledge test:

• Start studying at least 2-3 weeks before your test date
• Focus on understanding rather than memorizing
• Use our practice tests to find and strengthen weak areas
• Get plenty of rest the night before your test
• Eat a balanced meal before testing to stay focused
• Read each question completely before answering
• Pay attention to words like "always", "never" or "except"
• When unsure choose answers that emphasize safety
• Check your answers before submitting if the testing system allows
• Stay calm and focused throughout the test

Sample question: When do you signal before turning?

• Only when other vehicles are visible
• 100 feet before you turn
• As you start to turn
• When changing lanes

Answer: B. 100 feet before you turn

Practice tests cover the same topics and are in the same format as the Tennessee CDL knowledge tests, but the questions will be different. Well designed practice tests mimic the style, difficulty and content of the Tennessee CDL knowledge tests. These practice exams help you:

• Get used to question formats and wording
• Understand subject matter depth and breadth
• Learn time management strategies
• Develop critical thinking skills

Focus on understanding the concepts rather than memorizing the answers as the actual test draws questions from a comprehensive database and each test is unique.

Tennessee CDL knowledge tests are administered at designated Driver Service Centers throughout the state that offer commercial licensing services. Not all service centers offer CDL testing so check the Tennessee Department of Safety ‘amp; Homeland Security website or call ahead to confirm testing availability. Testing locations have specialized testing systems and trained staff for CDL exams. Major testing centers are located in Nashville, Memphis, Knoxville, Chattanooga and other cities across Tennessee.

Yes, appointments are highly recommended for CDL knowledge tests in Tennessee. Schedule your test by:

• Calling the CDL Help Desk at 615-251-5217
• Visiting a Driver Service Center in person
• Checking the Tennessee Department of Safety ‘amp; Homeland Security website for online scheduling options

Some locations may accept walk-ins for CDL testing but wait times can be long and you may not be able to test that day if the location is at capacity. Scheduling an appointment ensures you'll be tested at your preferred time and location making the process more efficient.

No. Tennessee requires all CDL knowledge tests to be taken in person at authorized Driver Service Centers to maintain security, verify identity and ensure test integrity. This in-person testing requirement is the same as federal regulations applying to all states. The face-to-face testing environment prevents cheating and confirms the person receiving the CDL is the same person who demonstrated the required knowledge.

For your Tennessee CDL knowledge test bring:

Required documents:

• Valid Tennessee driver's license or out of state license
• Social Security card or verification of your Social Security number
• Proof of U.S. citizenship or lawful permanent resident status (birth certificate, passport, permanent resident card, etc.)
• Two documents proving Tennessee residency
• Current DOT Medical Certificate (Form MCSA-5876)
• Completed CDL application
• Payment for applicable fees
• For Hazardous Materials: Additional identification for TSA background check

Additional items:

• Reading glasses if needed
• Appointment confirmation
• Medical history information for certification purposes

All documents must be original or certified copies—photocopies aren't accepted. Contact the Tennessee Department of Safety if you have questions about document requirements before your appointment.

Plan to arrive at least 15-20 minutes before your scheduled appointment to allow time for:

• Document verification
• Application processing
• Fee payment
• Getting settled before beginning the test

First-time applicants should arrive 30 minutes early to accommodate additional paperwork processing. Late arrivals may need to reschedule. Traffic and parking at Tennessee Driver Service Centers can be unpredictable, so allow extra time to ensure you're not rushed.

After passing your CDL knowledge tests in Tennessee, you'll receive a Commercial Learner's Permit (CLP) valid for 365 days with these conditions:

• You must wait at least 14 days before taking the skills test
• You can only drive with a qualified CDL holder in the passenger seat
• No passengers are permitted except for instructors, examiners, or trainees
• You cannot transport hazardous materials
• Other restrictions may apply based on vehicle type and endorsements

The specific endorsements you've passed tests for will be included on your CLP. Remember that if your CLP expires before you obtain your full CDL, all knowledge and skills tests will become invalid.

With your Tennessee Commercial Learner's Permit, you can practice driving commercial vehicles under the supervision of a qualified CDL holder. This supervised practice period is essential for developing the skills necessary to pass the skills test. You can practice all relevant maneuvers including pre-trip inspections, basic control skills, and road driving. Make the most of this practice time to become proficient with the specific commercial vehicle you'll use for your skills test.

In Tennessee, CDL knowledge test scores are valid for 365 days, which is the same as your CLP. If your CLP expires before you take your skills test, you'll need to retake all knowledge tests. Tennessee doesn't offer score validity extensions, so plan to take your skills test within the 365-day window to avoid re-taking the knowledge tests. This ensures your knowledge is current when you get your full CDL.

If you fail a Tennessee CDL knowledge test:

• You can retest as early as the next business day
• You only need to retest the specific tests you failed, not all tests
• Use our practice tests to focus on knowledge areas you need to improve
• Review incorrect answers to understand why they were wrong
• Consider using different study methods if certain topics are tough

Tennessee doesn't limit the number of times you can take the tests, but repeated failures mean you may need more preparation.

Sample question: After failing a knowledge test section, when can you retest?

• You must wait 30 days before retesting
• You can retest immediately at a different location
• You can retest on the next business day
• You must retest all test sections, including those you passed

Answer: C. You can retest on the next business day

After holding your Tennessee CLP for at least 14 days and completing any required Entry-Level Driver Training (ELDT):

• Call the CDL Help Desk at 615-251-5217 to test at a Tennessee Driver Service Center, or
• Contact an approved third-party testing organization
• Make sure your CLP is still valid and your medical certificate is current
• Arrange for a test vehicle that matches your CDL class
• Pay the skills test fee
• Choose a date and time

Skills tests are conducted at locations that may be different from knowledge test locations. The skills test includes three parts: pre-trip inspection, basic vehicle control skills, and on-road driving demonstration. Make sure you're prepared for all three before scheduling your test.