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Difficulty: MediumSpeed and Road Conditions

When approaching a curve on a wet or slippery roadway, a commercial driver should reduce speed to a safe level before entering the curve rather than braking while actively steering through the turn.

Answer: Answer

Answer

True
The statement is true because commercial driving safety standards mandate slowing down to a safe speed before entering any curve. On wet or slippery roadways, traction is substantially diminished; applying the brakes while turning combines braking and cornering forces, which easily causes wheels to lock and results in loss of directional control.

Step-by-Step Solution

1
Analyze tire friction demands during curve negotiation on low-traction road surfaces.
Tires possess a finite friction budget that must be shared between steering forces and braking forces.
Wet, icy, or snow-covered pavements significantly reduce the maximum adhesion available between tires and the road.
2
Determine the proper sequence of deceleration relative to curve entry.
All deceleration must occur on a straight trajectory prior to curve entry to reserve traction strictly for cornering.
Applying service brakes while turning places simultaneous longitudinal and lateral loads on the tires, triggering drive or steer wheel lockup.

Key Concept

Pre-curve speed adjustment on reduced-traction surfaces to avoid wheel lockup and maintain steering control.
Estimated Time:1m 0s
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Topics

Speed and Road Conditions

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