Texas Doubles and Triples Test
If you're pulling doubles or triples through the Permian Basin oil fields or across the Panhandle, this test covers the real-world hazards you'll face on Texas roads.
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This is the Texas Doubles and Triples endorsement test. It's 20 questions, you need 16 right, and you get 25 minutes.
Key Topics
- •Coupling and uncoupling sequences
- •Trailer sway and jackknife prevention
- •Texas-specific wind and heat hazards
About the Texas Doubles and Triples Test
Topics Covered
- ✓Coupling and uncoupling procedures — Texas examiners check that you can safely hook up doubles on uneven ground, common at truck stops along I-10.
- ✓Trailer stability and rollover prevention — especially important in the Hill Country where curves tighten without warning.
- ✓Jackknife causes and prevention — crosswinds on the Panhandle's flat highways can push your trailers sideways fast.
- + 3 more topics
📘 Study Tips & State Info
Texas DMV examiners care about the order of coupling steps. They'll ask you what to do first, second, third — don't skip a step. The handbook's sequence is the only one they accept. Practice it until you can recite it without looking.
Pay attention to the 'adverse driving conditions' section. Texas examiners add questions about driving in high winds, especially for doubles and triples. They want to know when you should park it versus push through. Hint: if you're empty and it's gusting over 40 mph on I-27, you're better off stopped.
Use your state's specific roads to visualize. When the manual says 'reduce speed on curves,' think of the cloverleaf on I-35 and US-290 in Austin. That mental link helps you remember the rule better than dry memorization.
The Texas DMV (TxDOT) administers all CDL written tests. You can take the Doubles and Triples test at any of the 230+ driver license offices that offer CDL services. Major testing locations include the Austin North, Dallas Mega Center, Houston Gessner, and San Antonio South offices. Appointments are booked online at txdmv.gov — walk-ins are accepted but wait times often exceed 2 hours.
You must already have your Class A CLP before taking this endorsement test. The test fee is $11. If you pass, you'll pay an additional $24 for the endorsement on your CDL. You don't need a separate skills test for doubles/triples — the endorsement is added to your existing Class A CDL after passing the written test.
Texas has a unique requirement: you must provide a valid Medical Examiner's Certificate (DOT medical card) at the time of testing. Intrastate drivers can use a Texas-specific medical waiver form, but interstate drivers need a federal card. Also, if you plan to haul doubles or triples for an oilfield company, you'll likely need a Hazmat endorsement too — that's a separate test and background check.
About the Texas Doubles and Triples Test
You need the Doubles and Triples endorsement to pull more than one trailer in Texas. That means you're driving longer, heavier, and more unstable combinations — and Texas roads will test you. From the crosswinds on I-40 near Amarillo to the tight turns on I-35 through Austin, you've got to know how these rigs behave.
The test covers coupling and uncoupling sequences, trailer sway control, and how to avoid jackknifing. It's not just book knowledge — you'll need to understand how Texas heat affects tire pressure and how oilfield traffic on US-285 changes your stopping distance. The Texas DMV follows FMCSA standards, but they expect you to apply it to our conditions.
You'll take this test at any TxDOT driver license office that offers CDL written exams. Appointments are strongly recommended — walk-in waits can be brutal. Bring your CLP, proof of identity, and medical certificate. The test costs $11 plus the $24 endorsement fee if you pass.
Passing this test isn't just about memorizing steps. It's about staying alive on roads where 18-wheelers share space with farm trucks, RVs, and distracted drivers. Study the handbook, but pay attention to the Texas-specific sections on adverse weather and mountainous terrain — yes, we have mountains in West Texas.
Topics Covered
Study Tips
Texas DMV examiners care about the order of coupling steps. They'll ask you what to do first, second, third — don't skip a step. The handbook's sequence is the only one they accept. Practice it until you can recite it without looking.
Pay attention to the 'adverse driving conditions' section. Texas examiners add questions about driving in high winds, especially for doubles and triples. They want to know when you should park it versus push through. Hint: if you're empty and it's gusting over 40 mph on I-27, you're better off stopped.
Use your state's specific roads to visualize. When the manual says 'reduce speed on curves,' think of the cloverleaf on I-35 and US-290 in Austin. That mental link helps you remember the rule better than dry memorization.
Texas Specific Information
The Texas DMV (TxDOT) administers all CDL written tests. You can take the Doubles and Triples test at any of the 230+ driver license offices that offer CDL services. Major testing locations include the Austin North, Dallas Mega Center, Houston Gessner, and San Antonio South offices. Appointments are booked online at txdmv.gov — walk-ins are accepted but wait times often exceed 2 hours.
You must already have your Class A CLP before taking this endorsement test. The test fee is $11. If you pass, you'll pay an additional $24 for the endorsement on your CDL. You don't need a separate skills test for doubles/triples — the endorsement is added to your existing Class A CDL after passing the written test.
Texas has a unique requirement: you must provide a valid Medical Examiner's Certificate (DOT medical card) at the time of testing. Intrastate drivers can use a Texas-specific medical waiver form, but interstate drivers need a federal card. Also, if you plan to haul doubles or triples for an oilfield company, you'll likely need a Hazmat endorsement too — that's a separate test and background check.