Free Idaho Doubles & Triples CDL Practice Test
6 real Doubles and Triples questions from the same bank our students use. No account, no email needed. You see the correct answer after each question, and your score at the end.
Take the Idaho Doubles & Triples test
Doubles and Triples is the T endorsement, for pulling more than one trailer. Whether you can run them, and where, is set by state law, so its value depends on where you drive more than any other endorsement.
- 6 questions, from the 49-question Doubles and Triples bank, one for each key manual topic
- Practice mode: the correct answer and manual reference show after each question
- 80% is a pass, the same standard as the real Idaho CDL knowledge test
Takes about 3 minutes. Keyboard: A to D to answer, Enter for next.
At the end you get your score, the correct answer for anything you missed, and the CDL manual section to go back to. No account needed, and you can retake it as often as you like.
Already included in Idaho Complete CDL Study Material. On its own it is Idaho CDL Doubles and Triples Study Material. Not sure what you need? The CDL Selector works it out from a few questions.
About the Idaho Doubles and Triples test
The questions come from the Idaho CDL manual, they are multiple choice, and you need 80% to pass, the same standard as every other CDL knowledge test. Idaho Transportation Department gives it, and you sit it on top of the General Knowledge test rather than instead of it.
The T endorsement covers pulling double or triple trailers. Whether you can pull them at all, and where, is decided by state law rather than federal rule, so this is the endorsement whose practical value varies most depending on where you drive.
What it covers
Our 6 free questions and the full 49-question Doubles and Triples bank are drawn from these manual sections:
- Pulling Double/Triple Trailers
- Coupling and Uncoupling
- Inspecting Doubles and Triples
- Doubles/Triples Air Brake Check
Every CDL applicant also sits the General Knowledge test, whatever class they are working toward. Try the free Idaho CDL permit practice test, or see which Idaho CDL endorsements you need.
What Idaho requires
- The CLP must be held at least 14 days before the skills test and is valid for one year.
- Two separate skills-test payments are made: $10 to the county and the examiner's fee directly to the examiner at the test.
- Your DOT medical examiner must be on the FMCSA National Registry.
- Idaho's ten-step CDL guide from ITD lays out the whole process in order.
Checked against Idaho Transportation Department on September 16, 2026. Rules change, so confirm anything that affects your booking before you travel.
Try another free CDL practice test
Each one is a different knowledge test, with real questions from the same bank our students use. No account and no email needed for any of them.
- Free CDL Permit practice test 10 questions
- Free Air Brakes practice test 7 questions
- Free Combination Vehicles practice test 8 questions
- Free HazMat practice test 6 questions
- Free Tanker practice test 6 questions
- Free Passenger practice test 6 questions
- Free School Bus practice test 8 questions
Where to go next
Work out which license class you need, then study the test that goes with it:
- Idaho CDL classes: what Class A, B and C each let you drive.
- Idaho CDL endorsements: H, N, P, S, T and X, and who needs each.
- What CDL do I need, by vehicle: the class and the tests for a dump truck, box truck, school bus, tanker and more.
- Idaho CDL study material: the full study guides, practice tests and narrated audio.
Other free CDL practice tests
Each CDL knowledge test is a separate exam, and every one of them has a free practice test here:
- Free CDL Permit Practice Testthe permit test
- Free Air Brakes CDL Practice Testa restriction removal, not an endorsement
- Free Combination Vehicles CDL Practice Testa core Class A test
- Free HazMat CDL Practice Testthe H endorsement
- Free Tanker CDL Practice Testthe N endorsement
- Free Passenger CDL Practice Testthe P endorsement
- Free School Bus CDL Practice Testthe S endorsement
See all eight free CDL practice tests →
Common questions
How long is the doubles and triples test?
Your state decides the number of questions. Federal rules require a set number drawn from an approved pool but do not fix a per-endorsement count, so confirm with Idaho Transportation Department. The pass mark is 80%.
Can I pull doubles or triples anywhere?
No, and this is the endorsement where that matters most. Whether multiple trailers are permitted, and on which roads, is decided by state law rather than by federal rule. The endorsement lets you operate them where they are allowed; it does not make them legal everywhere.
What does the doubles and triples test cover?
The doubles and triples section of the CDL manual: coupling and uncoupling a set, which shut-off valves must be open and which closed, the inspection points specific to converter dollies and multiple trailers, and the crack-the-whip and rollover behavior that extra trailers introduce.
Is this the same as the combination vehicles test?
No. Combination Vehicles is a core knowledge test for Class A and covers a single trailer. Doubles and triples is a separate endorsement with its own test, taken on top of it.