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Free TN CDL Double/Triple Trailers Practice Test 2025
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Based on 2025 TN commercial driver's license manual
- Triple-checked for accuracy
- Updated for March 2025
Since you’re here, you’re probably exploring the option of adding a Double and Triple Trailers endorsement to your Tennessee Commercial Driver’s License (CDL). This is an outstanding step toward expanding the scope of your transport offerings and significantly increasing your earnings potential. Home to the Appalachian Mountains, you’ll find rolling hills and flatlands as you pull doubles in Tennessee and you’ll have a competitive edge against other drivers lacking this endorsement. All you need to do is pass a 20-question multiple-choice knowledge test with a score of 80% (16 correct answers). Once you’ve passed, the “T” endorsement on your CDL will authorize you to pull two or three trailers in areas that allow it (Tennessee CDL Handbook 2025).
In the Volunteer State, you must be at least 18 years of age to add this certification to your CDL. For the younger folks just getting started, keep in mind that the age requirement to travel across state lines is 21 or older. For everyone, while the Double/Triple Trailers endorsement authorizes you to pull both doubles and triples, you are restricted to only pulling doubles in Tennessee. Rest assured though, double trailers are often used throughout Tennessee for the transport of automotive parts and vehicles (Nissan and General Motors have major manufacturing plants in Smyrna and Spring Hill, respectively), agricultural products like soybeans, corn, cotton, and livestock, whiskey and spirits (Lynchburg is a major producer), consumer goods and electronics, and forestry and paper products. By this point, you’re probably saying, “I’ve got to have this! But how do I get ready for this test?”
It’s exhausting looking at the ocean of online resources. That’s exactly why we offer our structured approach to help you focus on what’s really needed. As of March 2025, it includes 20 multiple-choice questions that simulate what you’ll face at the DMV on your test day! But wait, there’s more! While you work through our online Tennessee CDL Double/Triple Trailers Endorsement practice test, you’ll get real-time feedback on each answer allowing you to learn as you go instead of being blasted with multiple corrections at the end of the session.
Confident now that you’ve practiced with our free tests? When you feel ready, simply go to the DMV with your documents and application fee. Pass the test and you’ll be instantly elevated to a new highly-marketable level in your career.
6 min to complete
Available in EN and ES
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article. 
Verified by Steven Litvintchouk,
Chief Educational Researcher, Member of ACES.
Chief Educational Researcher, Member of ACES.
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What to expect on the actual TN DMV exam
20
questions
16
correct answers to pass
80%
passing score
More TN DMV Written Exam Resources
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