combination vehicle
A tractor or truck pulling one or more trailers.
Tractor-trailers, doubles, triples and a straight truck with a trailer are all combinations. They are heavier and longer, need more skill, and roll over more easily in quick turns.
Also called: combination vehicles
Why it matters on the CDL test
Questions ask what makes combinations different to drive and inspect, what happens when the air lines separate, and how to couple safely.
Appears in 39 test questions
See 13 questions on the Combination Vehicles testExample: Pulling a loaded trailer, you slow down before the ramp because a combination vehicle tips more easily.
In other languages
- Español
- vehículo combinado
- Русский
- автопоезд (combination vehicle)
- Українська
- автопоїзд
Related terms
Where it comes from
- CDL manual, Section 6 introduction and 6.1 Driving Combination Vehicles Safely
Checked on
4.9Unified rating across the App Store and Google Play · 6,500+ ratings
Store ratings as of Oct 15, 2026
Free practice tests on this site. All 2,500+ questions are in the app with a subscription.