Free CDL Combination Vehicles Practice Test
The Combination Vehicles test is required for a Class A CDL. It covers Section 6 of the CDL manual: rollover and crack-the-whip risks, trailer skids, the tractor protection valve and glad hands, and coupling and uncoupling step by step.
20 Combination Vehicles questions with three answer choices, scored at the real 80% pass mark (16 correct), with an explanation from the CDL manual for every answer.
Or start with a free Combination Vehicles drillYour trailer is stuck on a railroad crossing. What should you do first?
CDL Combination Vehicles test at a glance
- Who takes it
- Class A applicants: anyone who will drive a tractor-trailer or another combination over 26,000 pounds.
- Passing score
- 80%
- Answer choices
- 3 per question
- Manual
- Section 6
Your state sets the number of questions from the federal question pool. Our full Combination Vehicles practice test has 20 questions, so you need 16 correct to reach 80%. 37 original Combination Vehicles questions rotate through it, so a second try is a different test.
What’s on the Combination Vehicles test
The test comes from Section 6 of the CDL manual. Our questions cover it in 3 topics, and your practice score report shows how you did in each one.
- Driving combination vehicles10 practice questions
- Combination vehicle air brakes14 practice questions
- Coupling, uncoupling and inspection13 practice questions
Take the full Combination Vehicles test
20 Combination Vehicles questions with three answer choices, scored at the real 80% pass mark (16 correct), with an explanation from the CDL manual for every answer.
Or start with a free Combination Vehicles drillFree Combination Vehicles practice drills
Ten questions with the explanation after each answer. Create a free account to save your results; each drill’s first attempt is free.
CDL Combination Vehicles questions
Do I need the Combination Vehicles test for a Class A CDL?
Yes. Federal rules bar a state from issuing a Class A CLP or CDL to an applicant who fails the combination vehicle test (49 CFR 383.135).
What is on the CDL Combination Vehicles test?
Section 6 of the CDL manual: driving combinations safely, combination air brakes (trailer hand valve, tractor protection valve, service and emergency lines), coupling and uncoupling, and inspecting a combination vehicle.
Ready for the DMV?
20 Combination Vehicles questions with three answer choices, scored at the real 80% pass mark (16 correct), with an explanation from the CDL manual for every answer.
Or start with a free Combination Vehicles drillOther CDL practice tests
Questions are written from Section 6 of the model CDL manual; rules from the federal regulations, checked October 2026: Texas Commercial Motor Vehicle Drivers Handbook (DL-7C, AAMVA model CDL manual, revised March 2026) · 49 CFR 383.25 Commercial learner’s permit · 49 CFR 383.71 Driver application and certification procedures · 49 CFR 383.91 Commercial motor vehicle groups · 49 CFR 383.93 Endorsements · 49 CFR 383.133 Test methods · 49 CFR 383.135 Passing knowledge and skills tests · TSA Hazmat Endorsement Threat Assessment Program.
Original independent practice. Not affiliated with or endorsed by FMCSA, AAMVA or any state licensing agency.