Definition
A low-force test used after coupling to help confirm the trailer is held by the fifth-wheel connection.
Practical example
Example: With the trailer brakes applied, the driver gently pulls against the connection, then performs a visual inspection.
Why it matters
A tug test is useful but never replaces visually checking the locking jaws and kingpin.
Tug Test 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 Tug Test mean in trucking?
A low-force test used after coupling to help confirm the trailer is held by the fifth-wheel connection.
Why should a commercial driver understand Tug Test?
A tug test is useful but never replaces visually checking the locking jaws and kingpin.
This glossary is educational. Always follow current federal and state rules, the vehicle manufacturer’s instructions, and your motor carrier’s procedures.