Examkin

Question

Difficulty: EasySpeed on Curves and Downgrades

When approaching an exit ramp that features a sharp curve, when should a commercial driver reduce the vehicle's speed to a safe level?

  1. A
    Apply firm brake pressure while turning through the sharpest part of the curve.
  2. Slow down to a safe speed before entering the curve.Answer
  3. C
    Coast through the curve in neutral and brake only if the vehicle exceeds the posted limit.
  4. D
    Maintain travel speed until the trailer begins to lean, then apply the service brakes.

Answer

A commercial driver must slow down to a safe speed before entering the curve.
A commercial driver must always reduce speed to a safe level before entering a curve. Braking while already turning inside a curve is extremely hazardous because braking forces combined with lateral cornering forces can easily exceed tire traction, causing wheels to lock up and initiating a dangerous drive-wheel or trailer skid.

Step-by-Step Solution

1
Assess the upcoming curve and determine a safe entry speed prior to reaching the turn.
Identify that the vehicle must travel significantly slower than the posted limit if carrying cargo or operating under heavy loads.
Commercial vehicles have high centers of gravity and require lower cornering speeds to avoid tipping or skidding.
2
Apply the service brakes while traveling in a straight line before steering into the curve.
Vehicle speed is reduced safely without placing lateral turning stress on the braking tires.
Straight-line braking maintains maximum tire grip and prevents loss of directional control.
3
Maintain a steady speed or accelerate very lightly as the vehicle proceeds through the curve.
The combination remains stable and aligned in its lane throughout the turn.
Light power keeps the drive wheels engaged and stabilizes the chassis through the curve.

Key Concept

Curve Entry Speed Reduction
Estimated Time:45s
Rate this question

Topics

Speed on Curves and Downgrades

More questions from this topic