What a Doubles and Triples Endorsement Means
A doubles and triples endorsement is an addition to your Class A commercial driver's license that permits you to operate tractor-trailers with two or three trailers attached. Without this endorsement, your Class A license limits you to a single trailer. The endorsement is issued by the Texas Department of Public Safety (DPS) and appears on your license as a "T" restriction code.
This endorsement is required by federal law if you want to haul doubles or triples on public roads in Texas or any other state. The endorsement confirms you have passed knowledge and skills testing specific to the handling and safety requirements of multi-trailer combinations.
Key Takeaways
- You must already hold a valid Class A commercial driver's license before you can add a doubles and triples endorsement.
- The process requires passing a written knowledge test at a DPS office and a separate skills test with an examiner, both covering multi-trailer operation.
- You will need to bring your current Class A license, proof of citizenship or legal residency, and medical certification (CVSA medical card) to the DPS office.
- The skills test must be performed in an actual doubles or triples combination vehicle that meets federal specifications.
- Testing fees and processing times vary by DPS office location, so contact your local office before you go.
Step 1: Verify You Hold a Valid Class A License
Before you can test for the doubles and triples endorsement, you must already have an active Class A commercial driver's license. If you do not yet have your Class A, you will need to obtain it first through the standard CDL testing process at a DPS office.
Check your license to confirm it shows "Class A" in the vehicle class section. If your license has been suspended, revoked, or has expired, you cannot add an endorsement until your license status is restored or renewed. Contact your local DPS office if you are unsure about your license status.
Step 2: Gather Required Documents
Bring the following documents to the DPS office when you test for the endorsement:
- Your current Class A commercial driver's license
- Proof of citizenship or legal residency (passport, birth certificate, permanent resident card, or visa)
- A valid CVSA medical certificate (also called a DOT medical card), issued by a certified medical examiner within the past 24 months
- Proof of Texas residency if your address on your license is not current (utility bill, lease, or bank statement dated within 90 days)
The medical certificate is critical. If your CVSA card has expired or you do not have one, you must visit a certified medical examiner before you can test. The DPS office can provide a list of examiners in your area, or you can search the National Registry of Certified Medical Examiners online.
Step 3: Study the Doubles and Triples Knowledge Test
Before you go to the DPS office, study the Texas Commercial Driver's License Manual, specifically the section on doubles and triples. The knowledge test covers vehicle inspection procedures, coupling and uncoupling techniques, weight distribution, braking systems unique to multi-trailer rigs, and safe operating practices.
The written test is typically 20 questions, and you must score at least 80 percent to pass. You can take the test on a computer at the DPS office. If you fail, you can retake it the same day or return on another day, depending on the office's policy. There is usually a fee per test attempt.
Study materials are available free on the DPS website and through commercial driver training schools. Many training schools also offer classroom instruction specifically for the doubles and triples endorsement if you prefer guided preparation.
Step 4: Schedule and Complete the Skills Test
After you pass the written knowledge test, you must schedule a skills test with a DPS examiner. The skills test is a behind-the-wheel evaluation performed in an actual doubles or triples combination vehicle. You cannot use a simulator or a single-trailer truck for this test.
The vehicle must meet federal specifications for doubles and triples combinations, including proper lighting, brakes, coupling devices, and safety equipment. If you do not own or have access to such a vehicle, many commercial driver training schools offer vehicles for testing purposes. Contact schools in your area to ask about skills test vehicle rental or partnerships with DPS examiners.
During the skills test, the examiner will evaluate your ability to perform pre-trip inspections, couple and uncouple trailers, maneuver the vehicle, and operate it safely on public roads. The test typically takes 45 minutes to an hour. You must pass all components to receive the endorsement.
Step 5: Pay Fees and Receive Your Endorsement
DPS charges separate fees for the knowledge test and the skills test. Fees vary slightly by office location but typically range from $15 to $30 per test. Some offices accept cash, check, or card; confirm payment methods when you call to schedule.
Once you pass both the knowledge and skills tests, the DPS office will issue your updated Class A license with the doubles and triples endorsement added. You may receive a temporary paper license when ready and the permanent card by mail within one to two weeks, or you may receive the permanent card on the spot depending on your office's procedures.
Your endorsement will remain valid as long as your Class A license is valid. When you renew your Class A license, the endorsement carries forward automatically unless you have violated endorsement restrictions or lost your CDL privileges.
What Happens If You Fail the Skills Test
If you do not pass the skills test on your first attempt, you can retake it. There is typically a fee for each attempt. You do not need to retake the knowledge test unless your passing score expires (policies vary by office, but scores often remain valid for 180 days).
Before you retake the skills test, ask the examiner for specific feedback on which maneuvers or procedures you need to improve. Many training schools offer refresher instruction focused on the areas where drivers typically struggle, such as coupling procedures or backing with multiple trailers.
Frequently Asked Questions
Do I need formal training before I test for the doubles and triples endorsement?
No formal training is required by law, but it is strongly recommended. Many drivers study the manual independently and pass, while others benefit from classroom or hands-on instruction at a commercial driver training school. The choice depends on your experience level and learning style.
Can I take the skills test in a doubles combination if I want to haul triples?
Yes. If you pass the skills test in a doubles vehicle, your endorsement covers both doubles and triples. You do not need separate tests for each configuration. The endorsement is the same regardless of which vehicle you used during testing.
What if my medical certificate expires before my license renewal?
Your Class A license becomes invalid if your medical certificate expires, even if the license card itself has not reached its expiration date. You must renew your medical certificate with a certified examiner and notify DPS of the new certificate number. Some offices allow you to update this information online or by mail.
How long does the entire process take from start to finish?
If you already hold a Class A license and have a current medical certificate, you can complete both the knowledge and skills tests in one or two visits to the DPS office. The knowledge test takes 30 to 45 minutes; the skills test takes 45 minutes to an hour. Scheduling delays vary by office and season, so contact your local DPS office for current wait times.
Can I test for the doubles and triples endorsement at any DPS office in Texas?
Most DPS offices offer the knowledge test, but not all offer skills testing. Skills tests are typically available only at larger regional DPS offices or through approved third-party examiners. Contact your local DPS office to confirm which services they provide and where you can schedule a skills test if they do not offer one.