When glad hands are coupled, the seals should be pressed together at an angle of:
Detailed Explanation
The correct answer is "90 degrees". This question tests combination vehicles knowledge and the safest action expected of a commercial driver. The question asks for an action, so choose the step that controls the immediate hazard before convenience or speed.
Correct Answer: 90 degrees
Why This Matters on the CDL Test
Use this as part of your Combination Vehicles 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 Combination Vehicles questions easier when the exam changes the wording.
Answer Review
Choose "90 degrees" because this answer matches the safe CDL action for combination vehicles knowledge. 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
- 45 degrees"45 degrees" does not best answer this combination vehicles knowledge 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.
- 180 degrees"180 degrees" does not best answer this combination vehicles knowledge 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.
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Start Practice TestRelated Questions
49. When connecting the glad hands, press the two seals with the coupler together at what degree to each other?
12. If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?
15. Why should you lock the tractor glad hands (or dummy couplers) to each other when you are not towing a trailer?
38. If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?
39. Glad hands are used to connect the:
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.