CDL · CDL general knowledge
What is the usual gear rule for heading downhill in a modern truck that has a manual transmission?
Correct answer: Pick a lower gear than you would need going up that grade.
Answer options
- APick the same gear you would need going up that grade
- BPick a lower gear than you would need going up that grade Correct
- CShift into neutral and let the truck coast down the grade
Why
Modern trucks have streamlined shapes and low-friction parts, so very little drag holds them back on a downgrade. That is why they usually need a lower gear going down than going up, and coasting in neutral is dangerous because it gives up engine braking.
About this question
Topic: CDL general knowledge License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
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This question is part of Mountain Grades and Brake Fade (16 questions). Take the full set and check your score.
Practice Mountain Grades and Brake FadeMore questions from Mountain Grades and Brake Fade
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- What tends to happen to your vehicle's speed as you travel down a long grade?
- Partway down a long, steep grade, your brakes overheat and stop working. What is your best course of action?
- Which statement correctly describes downshifting when you face a long downgrade?
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