JJ Keller Entry Level Driver Training CDL Practice Test 2026 – Comprehensive All-in-One Guide to Exam Success!

Question: 1 / 400

What is one way to verify that the coupling is secure?

Visually inspect only

Perform a tug test

Performing a tug test is the most reliable method to verify that the coupling is secure. This test involves applying a strong pull on the trailer or the coupling mechanism to ensure that it is properly attached and will not disengage while in motion. The tug test provides a physical confirmation of the integrity of the connection, which is critical for safety during hauling operations.

Visual inspections can provide some insights, but they may not always reveal issues that could lead to a failure. Additionally, listening for clicking sounds or feeling for vibrations can be unreliable indicators of a secure coupling, as these methods do not provide definitive proof that the connection is solid. Thus, the tug test stands out as an essential step in confirming that the coupling is secure before beginning a journey.

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Listen for clicking sounds

Feel for vibrations

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