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Question

Difficulty: MediumSpeed on Curves and Downgrades

When navigating a steep downgrade, if vehicle momentum causes speed to exceed the safe limit, the driver should depress the clutch and shift to a lower gear during the descent to restore engine braking control.

Answer: Answer

Answer

False
The statement is false because commercial drivers must always select and engage the correct low gear before starting down a grade. Attempting to shift gears after speed has built up on a downgrade can cause the transmission to get stuck in neutral, entirely removing the engine's retarding power and causing severe brake overheating.

Step-by-Step Solution

1
Evaluate standard commercial vehicle operating rules for descending steep grades.
CDL regulations require selecting and engaging the proper low gear before cresting the hill and starting down the slope.
The transmission must already be locked into the appropriate gear so engine compression braking is active from the start.
2
Analyze the mechanical consequence of attempting to downshift during an active descent.
As vehicle speed and momentum increase, disengaging the clutch often prevents the transmission from synchronizing with a lower gear, causing gear lockout.
Getting stuck in neutral removes all engine braking capability and forces total reliance on service brakes.
3
Determine the validity of the statement.
The statement is false.
Downshifting mid-descent is unsafe and strictly contrary to standard CDL procedures.

Key Concept

Pre-Descent Low Gear Selection and Transmission Lockout Prevention
Estimated Time:1m 0s
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Topics

Speed on Curves and Downgrades

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