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Question

Difficulty: MediumMountain Driving and Steep Grades

While descending a steep mountain grade, placing a vehicle's transmission into neutral to coast downhill is an acceptable and legal driving method.

Answer: Answer

Answer

False. Coasting downhill in neutral on a mountain grade is illegal and dangerous because it eliminates engine braking assistance, leading to overheated brakes and loss of vehicle control.
The statement is false because coasting downhill in neutral disengages the engine from the drive train, completely eliminating engine braking. On steep mountain grades, relying solely on mechanical brakes leads to rapid heat buildup, brake fade, and loss of stopping ability, which is why traffic laws prohibit coasting in neutral.

Step-by-Step Solution

1
Analyze the mechanics of mountain descents
Recognize that controlling speed on steep grades requires engine braking (downshifting) combined with supplemental foot brake usage.
Friction brakes alone cannot sustain prolonged heavy braking without overheating.
2
Evaluate the effect of placing the transmission in neutral
Placing the vehicle in neutral disconnects the engine from the wheels, eliminating engine braking entirely.
Without engine compression to slow the vehicle, gravity accelerates the car rapidly.
3
Determine legal and safety standards
Identify that coasting in neutral on grades is prohibited by traffic laws specifically to prevent catastrophic brake failure.
Driver safety depends on maintaining full control over vehicle acceleration and braking systems.

Key Concept

Engine braking and legal prohibitions against coasting in neutral on steep grades
Estimated Time:45s
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Topics

Mountain Driving and Steep Grades

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