Definition
The process and system used to connect a tractor to a trailer or another towed unit.
Practical example
Example: The driver visually verifies the kingpin is locked in the fifth wheel and performs a tug test.
Why it matters
Correct coupling prevents trailer separation and is a core Class A inspection skill.
Coupling in CDL training
CDL students should be able to recognize this term, explain it in plain language, and connect it to safe vehicle operation, inspection, licensing, or freight work as applicable. Review the term in context and practice using it during classroom study and hands-on training.
Frequently asked questions
What does Coupling mean in trucking?
The process and system used to connect a tractor to a trailer or another towed unit.
Why should a commercial driver understand Coupling?
Correct coupling prevents trailer separation and is a core Class A inspection skill.
This glossary is educational. Always follow current federal and state rules, the vehicle manufacturer’s instructions, and your motor carrier’s procedures.