Question

Difficulty: MediumOff-Road Recovery and Pavement Edge Drops

When a vehicle's right-side tires slip over a pavement edge drop, attempting to steer back onto the road immediately without first decelerating can cause the tire to catch on the asphalt lip and propel the vehicle across the lane.

Answer: Answer

Answer

True. Steering back onto the road immediately without first reducing speed causes tire scrubbing along the pavement lip, which can suddenly snap the vehicle across the roadway when traction is regained.
When tires drop off an edge, steering back immediately creates friction resistance known as scrubbing. When the tire eventually grips the asphalt, the vehicle swerves abruptly, often resulting in loss of control.

Step-by-Step Solution

1
Analyze the physical force created when tires scrub along a pavement edge drop.
Identified that resistance builds up along the tire sidewall while attempting to climb the asphalt lip at speed.
Understanding why high-speed steering re-entry is dangerous prevents violent vehicle instability.
2
Evaluate the vehicle motion when the tire finally climbs over the drop-off.
Recognized that the vehicle abruptly jerks in the direction the wheels are turned as soon as friction re-engages.
This sudden snap causes loss of directional control.
3
Determine the proper procedure.
Confirmed that drivers must ease off the accelerator, keep the wheel straight, slow down, and only then make a gentle quarter-turn steer back onto the pavement.
Deceleration reduces momentum so that returning to the road is smooth and controlled.

Key Concept

Pavement edge drop scrubbing and rollover prevention
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