CDL Combination Vehicles practice test

Required for Class A. Coupling, uncoupling, trailer brakes and rollover prevention. 20 questions, every answer explained. Free, no signup.

Drawn from a bank of 58 questions, weighted across every knowledge area. The selection changes daily, though on a subject this narrow you will see some questions again.

What this test covers

Federal law prescribes the knowledge areas a CDL applicant must be tested on. This bank is organized by them, and each practice test draws proportionally across all of them rather than sampling at random.

What's at stake

Score under 80% and a Group A CDL cannot be issued to you at all.

Common questions

How many questions are on the real Combination Vehicles test?

Test length is set by your state within the federal framework, so it varies — commonly around 50 for General Knowledge. What doesn't vary is the passing score: 80%, federally, everywhere. Confirm the question count with your state licensing agency.

Who has to take the Combination Vehicles test?

Class A (tractor-trailer) applicants.

Can I retake it if I fail?

Score under 80% and a Group A CDL cannot be issued to you at all. Most states allow retakes, often after a waiting period — check with yours.

Are these the real test questions?

No. The federal question pool isn't public, states develop their own wording from it, and versions rotate. These are original questions covering the same federally required knowledge areas — which is what the real test is built from too.

The rest of the battery

A CDL is several tests, not one. See the full battery and which ones apply to you.