70. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
Detailed Explanation
The correct answer is "a. The rear trailer is twice as likely to turn over as the tractor.". This question tests combination vehicles knowledge and the safest action expected of a commercial driver. For a differently worded version of this question, identify the hazard first and then choose the answer that preserves control, visibility, or legal compliance.
Correct Answer: a. The rear trailer is twice as likely to turn over as the tractor.
Why This Matters on the CDL Test
This is a vehicle-control question. Practice connecting the rule to the driving action: checking mirrors, managing space, planning turns, and avoiding sudden movements are all tested because they prevent crashes in real traffic.
How to Remember It
Say the rule in your own words, then explain why the wrong answers are unsafe or incomplete. That habit makes similar Combination Vehicles questions easier when the exam changes the wording.
Answer Review
Choose "a. The rear trailer is twice as likely to turn over as the tractor." because this answer matches the safe CDL action for vehicle control and low-speed maneuvering. On the knowledge test, the safest answer is usually the one that protects space, control, visibility, legal compliance, or inspection accuracy before the vehicle is put at risk.
Why the other answers are weaker
- b. The front trailer is twice as likely to turn over as the tractor."b. The front trailer is twice as likely to turn over as the tractor." does not best answer this vehicle control and low-speed maneuvering question. When you see a similar option on the CDL permit test, compare it against the exact safety rule and choose the answer that prevents the most immediate risk.
- c. Each trailer is equally likely to turn over as the tractor."c. Each trailer is equally likely to turn over as the tractor." does not best answer this vehicle control and low-speed maneuvering question. When you see a similar option on the CDL permit test, compare it against the exact safety rule and choose the answer that prevents the most immediate risk.
Test-Day Checklist
- Read the question once for the topic, then read it again for the exact CDL action being tested in Combination Vehicles.
- Eliminate answers that sound convenient but skip an inspection, warning sign, or safety step.
- Say the correct rule out loud before moving on so you can recognize it when the exam changes the wording.
Ready to practice for real?
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Start Practice TestRelated Questions
28. You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You would expect the trailer brakes to come on and:
42. When driving a set of doubles it is necessary to close which shut-off valve in the last trailer.
87. A trailer is most likely to jackknife when it is:
In a sudden turn, the ____ trailer is the most likely to turn over.
1. You are coupling a semi trailer to your tractor but have not yet backed under. The trailer is at the right height when:
Keep Studying Combination Vehicles
Question pages help you review one rule at a time. To build test-day speed, move back into the full Combination Vehicles practice test and answer a mixed set without looking at the explanation first.
State CDL Practice Paths
After you understand this answer, use a state practice path to connect the federal CDL rule with the DMV test pages drivers search for most.