Tennessee Doubles and Triples Test
You'll need this endorsement to pull doubles or triples on Tennessee interstates — including the FedEx hub in Memphis and the steep grades on I-24 Monteagle.
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Ready for the Tennessee Doubles and Triples endorsement? This practice test covers exactly what you'll see at the DMV.
Key Topics
- •Coupling sequences
- •Stability on grades and curves
- •Off-tracking and braking
About the Tennessee Doubles and Triples Test
Topics Covered
- ✓Coupling and uncoupling procedures — Tennessee examiners want the exact order, especially when you're hooking up a set of doubles on uneven ground at a truck stop.
- ✓Trailer stability and rollover prevention — critical on I-40's tight curves near the Smokies and the crosswinds on the plateau west of Nashville.
- ✓Off-tracking and turning radius — longer combinations cut sharper corners; you need to know this for narrow on-ramps in urban areas like Chattanooga.
- + 3 more topics
📘 Study Tips & State Info
Start with the coupling sequence. The Tennessee CDL manual lays it out step-by-step, and the test will ask you the exact order. Don't just memorize — picture yourself doing it at a loading dock in Memphis with a FedEx double. The test also loves questions about what happens if you connect the gladhands in the wrong order. Know that backward connection can lock up your trailer brakes.
Braking is huge in Tennessee. The Monteagle grade is the classic example, but any mountain road in east Tennessee will punish a driver who rides the brakes. Study the concept of 'snubbing' the brakes on a long downgrade. The test will ask about the proper use of the trailer brake hand valve and the tractor parking brake. Don't confuse them.
Off-tracking questions are common. Longer trailers mean wider turns. On Tennessee's two-lane roads, that's a real issue. Practice visualizing where your rear trailer tires will go when you turn a tight corner. The test will give you scenarios with different trailer lengths. And finally, know the weight limits for triples — Tennessee follows federal bridge formula, but they enforce it at weigh stations.
Tennessee requires the Doubles and Triples endorsement (T) for any Class A driver who wants to pull more than one trailer. You must already have a Class A CDL with the Combination Vehicles endorsement. The test is administered at Tennessee Driver Services Centers (formerly DMV) across the state. You can find locations in Nashville, Memphis, Knoxville, Chattanooga, and many smaller cities.
You'll need to make an appointment — walk-ins are sometimes accepted but not guaranteed. Bring your current CDL, Medical Examiner's Certificate, and proof of Tennessee residency. The fee for the endorsement test is $12 (subject to change). The written test is computer-based, and you get immediate results. If you fail, you can retake it the next business day, but you'll pay the fee again.
One thing that catches drivers off guard: Tennessee allows doubles and triples only on designated highways (mostly interstates). The test might ask about route restrictions. Also, Tennessee has specific rules about the length of the combination — no more than 65 feet for a double trailer combination unless you have a special permit. Know those limits.
About the Tennessee Doubles and Triples Test
If you're pulling doubles or triples in Tennessee, you're on some of the busiest trucking corridors in the Southeast. The I-40 corridor through Nashville and Knoxville sees everything from FedEx doubles out of Memphis to livestock trailers headed east. And then there's the Monteagle grade on I-24 — a 5-mile descent that's wrecked plenty of drivers who didn't respect trailer dynamics.
The Tennessee Doubles and Triples test is a separate endorsement (T) you need after you get your Class A with Combination Vehicles. It's 20 multiple-choice questions, 80% to pass. The test focuses on what's different when you're pulling two or three trailers: coupling sequences, off-tracking, stability on curves, and how to handle a trailer pushing you downhill.
Tennessee examiners pay close attention to coupling procedures — they want the exact sequence, especially the order of the gladhands and the electrical lines. They also ask about the weight distribution rules for triple trailers, which matter on Tennessee's winding mountain roads. Fog in the valleys and black ice on bridges in winter make stability questions even more important.
This practice test follows the Tennessee CDL handbook and the FMCSA standards. Take it a few times until you're scoring 90% or better. The real test won't feel like a surprise.
Topics Covered
Study Tips
Start with the coupling sequence. The Tennessee CDL manual lays it out step-by-step, and the test will ask you the exact order. Don't just memorize — picture yourself doing it at a loading dock in Memphis with a FedEx double. The test also loves questions about what happens if you connect the gladhands in the wrong order. Know that backward connection can lock up your trailer brakes.
Braking is huge in Tennessee. The Monteagle grade is the classic example, but any mountain road in east Tennessee will punish a driver who rides the brakes. Study the concept of 'snubbing' the brakes on a long downgrade. The test will ask about the proper use of the trailer brake hand valve and the tractor parking brake. Don't confuse them.
Off-tracking questions are common. Longer trailers mean wider turns. On Tennessee's two-lane roads, that's a real issue. Practice visualizing where your rear trailer tires will go when you turn a tight corner. The test will give you scenarios with different trailer lengths. And finally, know the weight limits for triples — Tennessee follows federal bridge formula, but they enforce it at weigh stations.
Tennessee Specific Information
Tennessee requires the Doubles and Triples endorsement (T) for any Class A driver who wants to pull more than one trailer. You must already have a Class A CDL with the Combination Vehicles endorsement. The test is administered at Tennessee Driver Services Centers (formerly DMV) across the state. You can find locations in Nashville, Memphis, Knoxville, Chattanooga, and many smaller cities.
You'll need to make an appointment — walk-ins are sometimes accepted but not guaranteed. Bring your current CDL, Medical Examiner's Certificate, and proof of Tennessee residency. The fee for the endorsement test is $12 (subject to change). The written test is computer-based, and you get immediate results. If you fail, you can retake it the next business day, but you'll pay the fee again.
One thing that catches drivers off guard: Tennessee allows doubles and triples only on designated highways (mostly interstates). The test might ask about route restrictions. Also, Tennessee has specific rules about the length of the combination — no more than 65 feet for a double trailer combination unless you have a special permit. Know those limits.