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Doubles & Triples Practice Question 40

TDoubles & Triples · Question 40

A driver of a doubles combination noticing the rear trailer wandering on a straight road should:

• AContinue
• BStop in a safe area to inspect couplings, tire pressures, and load distribution
• CSpeed up
• DOpen the windows

Correct answer: B. Stop in a safe area to inspect couplings, tire pressures, and load distribution

Why: Wandering may indicate coupling looseness, low tire pressure, axle issue, or shifted load. Investigate before continuing.

How this question fits the Doubles/Triples test

Each additional articulation point multiplies rearward amplification. A driver pulling triples must steer earlier, brake sooner, and inspect twice as much equipment as a single-trailer driver.

Study technique for this topic

Learn the correct trailer placement order by weight, the procedure for converting a single to a double, and the special inspection items unique to converter dollies and pintle hook assemblies.

Related Doubles/Triples practice questions

• Q9. Air supply lines for the rear trailer pass through:
• Q22. A common cause of separation between a tractor and trailing unit is:
• Q35. When swapping which trailer is in front, drivers should re-verify:
• Q49. When pulling triples in mountainous terrain, the most important driving principle is:
• Q2. A 'converter dolly' is:

Continue your CDL preparation

The Doubles & Triples portion of the CDL knowledge exam covers more than this single question. Use this site's full Doubles & Triples bank to drill every topic, then test yourself with one of our state-specific practice sets to confirm you are ready for the actual DMV exam in your state. Always check your state's CDL handbook for any local addenda before the test day.

If you are still building your overall CDL foundation, start with the General Knowledge bank — every CDL applicant must pass it — and then work outward to the endorsements you plan to add.