A tread depth of ____ should be in every major groove of a tire that is not in the front of a commercial motor vehicle.
Detailed Explanation
The correct answer is "2/32 of an inch". This question tests wheel-end inspection, tire condition, and the correct response to defects or failure. Because the prompt uses negative wording, identify the normally correct safety rules first, then select the exception.
Correct Answer: 2/32 of an inch
Why This Matters on the CDL Test
Use this as part of your General Knowledge review. The real CDL knowledge test rewards drivers who understand the reason behind each rule, not only the answer letter, so read the explanation and then try a few related questions.
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 General Knowledge questions easier when the exam changes the wording.
Answer Review
Choose "2/32 of an inch" because this answer matches the safe CDL action for tire inspection and failure response. 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
- 4/32 of an inch"4/32 of an inch" does not best answer this tire inspection and failure response 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.
- 6/32 of an inch"6/32 of an inch" does not best answer this tire inspection and failure response 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 General Knowledge.
- 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
A tread depth of ____ should be in every major groove of a front tire.
213. What is the minimum tread depth for front tires?
218. What is the minimum tread depth for tires other than front tires?
What minimum tread depth is required on front tires of a commercial vehicle?
349. It is illegal to drive a commercial motor vehicle with a BAC this high, even though a BAC below the level does not mean it is safe to drive.
Keep Studying General Knowledge
Question pages help you review one rule at a time. To build test-day speed, move back into the full General Knowledge 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.