Doubles and Triples Flashcards
7 cards from real CDL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Doubles and Triples flashcards as text
Why is lane changing riskier with triples than with a single trailer?
Answer: Rearward amplification makes the rear trailers swing more
Each trailer adds amplification, making sudden lane changes dangerous.
When driving downhill with doubles, you should:
Answer: Select a lower gear before starting down and use proper braking
Using a lower gear and controlled braking keeps speed safe and avoids brake fade.
Which action best reduces trailer sway and rollover risk on curves with doubles?
Answer: Slow down before entering the curve
Reduced speed lowers lateral forces on the rear trailer.
Which of these should NOT be used to hold a parked combination?
Answer: The trailer hand valve
Air can leak off the hand valve, releasing the brakes, so never rely on it for parking.
In a skid, why is a rig with a lighter trailer in front more dangerous?
Answer: It is less stable and the rear heavier trailer can push the front trailer
A heavier rear trailer can swing or push the lighter front units.
When should you perform a full air brake check on a double-trailer combination?
Answer: As part of every pre-trip inspection
All brake systems in the combination must be checked before each trip.
How does passing a doubles rig compare with passing a single trailer?
Answer: It takes longer and needs more room
The extra length means more time and space are required to pass.
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