Examkin

Question

Difficulty: MediumHydroplaning and Wet Road Traction Loss

When a vehicle experiences hydroplaning on standing water, shifting the transmission into neutral (or depressing the clutch in a manual vehicle) assists in traction recovery by removing engine torque and engine braking from the drive wheels.

Answer: Answer

Answer

True. Shifting the transmission into neutral (or depressing the clutch) removes engine rotational forces, allowing the driven wheels to roll freely at ground speed to safely regain road traction.
Shifting into neutral or depressing the clutch removes rotational forces (both acceleration torque and engine deceleration drag) from the drive wheels. This enables the tires to spin at true ground speed, facilitating faster water evacuation through the tread grooves and smoother traction recovery as standing water depth decreases.

Step-by-Step Solution

1
Analyze how hydroplaning affects tire-to-road contact.
Hydroplaning causes tires to ride on a cushion of water, separating the tire tread from the pavement.
Understanding the physical state of the tires during total traction loss is required to determine effective control responses.
2
Evaluate the effect of engine drive forces during a hydroplane event.
Active engine torque can spin driven tires faster than vehicle speed, while sudden engine braking can slow driven tires below vehicle speed.
Any mismatch between tire rotation speed and actual ground speed delays traction re-establishment and can provoke a skid.
3
Determine the impact of shifting into neutral.
Placing the vehicle in neutral disengages the engine, enabling tires to coast and spin freely at matching vehicle ground speed.
Free-rolling tires maximize water channel evacuation efficiency and ensure smooth re-engagement with the pavement surface.

Key Concept

Disengaging Powertrain Torque to Regain Wet Road Traction
Rate this question

Topics

Hydroplaning and Wet Road Traction Loss

More questions from this topic