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CDL Doubles/Triples (T) Endorsement Test

Pulling doubles and triples: practice questions

Our CDL Doubles/Triples bank has 28 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

When parking doubles or triples, what spot should you avoid?

  1. One you cannot pull straight through
  2. One with good lighting
  3. One on level pavement
  4. One next to other parked trucks
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A. One you cannot pull straight through — Make sure you do not get in a spot you cannot pull straight through (CDL Manual 7.1.7)

Question 2

How do doubles and triples compare with other commercial vehicles for stability?

  1. They are only less stable when empty
  2. They are more stable
  3. They are just as stable
  4. They are less stable
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D. They are less stable — There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles (CDL Manual 7.1)

Question 3

What effect makes doubles and triples more likely to turn over than other combinations?

  1. The jake brake effect
  2. The crack-the-whip effect
  3. The bobtail effect
  4. The hydroplaning effect on wet roads
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B. The crack-the-whip effect — Doubles and triples are more likely to turn over than other combination vehicles because of the crack-the-whip effect (CDL Manual 7.1.2)

Question 4

Why must you look far ahead when pulling doubles?

  1. So you can brake hard at the last moment
  2. So you don't need to check your mirrors
  3. So you can slow down or change lanes gradually
  4. So you can follow the car ahead more closely in heavy traffic
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C. So you can slow down or change lanes gradually — Doubles and triples must be driven very smoothly to avoid rollover or jackknife; look far ahead so you can slow down or change lanes gradually (CDL Manual 7.1.4)

Question 5

Before entering or crossing traffic with doubles, what must you make sure of?

  1. That the rear trailer is empty
  2. That your flashers are on
  3. That other drivers wave you in
  4. That the gap is large enough
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D. That the gap is large enough — Make sure you have large enough gaps before entering or crossing traffic (CDL Manual 7.1.5)

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