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Difficulty: MediumHydroplaning and Wet Road Traction Loss

Under-inflated tires increase a vehicle's risk of hydroplaning because insufficient internal air pressure causes the tire tread center to bow inward, reducing its ability to evacuate standing water.

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Answer

True. Under-inflation reduces tread stiffness and causes the center of the tire footprint to sag inward, hindering water displacement and increasing hydroplaning risk.
The statement is true. Under-inflation compromises the tire's structural profile, causing the center of the tread to flex inward. This prevents water from channeling properly out through the grooves, allowing a wedge of water to lift the tire off the road at lower speeds.

Step-by-Step Solution

1
Examine the role of tire pressure in maintaining tread footprint geometry.
Proper inflation ensures even weight distribution and keeps tread channels open across the entire contact patch.
Water evacuation relies on stiff, open tread channels that force water outward under the vehicle's weight.
2
Analyze how under-inflation alters the contact patch under wet conditions.
Low pressure reduces support at the center of the tread, causing it to cup upward/inward away from the pavement.
The lack of central support creates a pocket that traps standing water rather than sweeping it away.
3
Evaluate the resulting effect on hydroplaning velocity thresholds.
Trapped water builds up dynamic pressure beneath the tire more rapidly, causing the vehicle to lose pavement contact at lower speeds.
Hydroplaning occurs as soon as dynamic water pressure exceeds the vehicle's unit ground pressure.

Key Concept

Impact of Tire Inflation Pressure on Water Channeling and Hydroplaning Onset
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Topics

Hydroplaning and Wet Road Traction Loss

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