Combination Vehicles practice test
The Class A test: a truck and a trailer as one unit.
Combination Vehicles is the knowledge test for Class A — a power unit and one or more trailers coupled together. It is required for a Class A licence because a combination behaves differently from a single vehicle: it is longer, turns more widely, takes longer to stop, and can fold up or push its trailer. The test covers how a combination is put together and taken apart — the fifth wheel, the kingpin, the glad hands and air lines, the electrical line — and how it drives: off-tracking through corners, trailer sway, jackknifing, backing, turning, braking and controlling a trailer under load. It also covers the special handling of doubles and triples at the level the test requires. This bank is one of the three that make up the launch subset with General Knowledge and Air Brakes, the combination a Class A candidate actually needs. Every item here is written for this site and carries its full explanation, free.
CV-001
A combination vehicle is:
These questions are written to the federal knowledge areas every state is required to test. They are not your state's questions — no free site has those. Your state writes its own test from its own CDL manual, and that manual is the thing to study.
All the tests
The requirement matrix on the home page computes which of the eight you need.
This site prepares for a written knowledge test. It is not driver training, it is not ELDT, and nothing on it substitutes for your state's CDL manual or a registered training provider. Air brake procedure, coupling, load securement and hazardous-materials handling are safety-critical, and this site never teaches them as something to do.