Examkin

Question

Difficulty: MediumSpeed on Curves and Downgrades

Which speed management technique should a commercial driver follow when approaching and navigating a sharp curve?

  1. A
    Maintain cruising speed until reaching the apex of the curve, then brake firmly to reduce speed while turning.
  2. Reduce speed to a safe level before entering the curve, then maintain a steady speed or accelerate slightly through the turn.Answer
  3. C
    Rely on the vehicle retarder during the curve while ignoring perception and reaction distance on entry.
  4. D
    Engage maximum auxiliary retarder braking inside the curve on slippery surfaces to control lateral momentum.

Answer

Reduce speed to a safe level before entering the curve, then maintain a steady speed or accelerate slightly through the turn.
The correct answer emphasizes reducing vehicle speed to a safe level on the straightaway before entering the curve. Slowing down prior to curve entry allows the tires to devote maximum available traction to lateral steering forces, preventing skids and vehicle rollovers.

Step-by-Step Solution

1
Assess the curve and posted advisory speed prior to entry.
Driver identifies the need to reduce vehicle speed before initiating the turn.
Tires require traction for steering forces; braking in a turn reduces available side traction.
2
Downshift if necessary and brake on the straight section before the curve.
Vehicle enters the curve at a controlled, safe speed.
Downshifting or heavy braking while turning can lock drive wheels and trigger skids.
3
Maintain smooth throttle or light acceleration through the turn.
Vehicle remains stable and tracks safely through the curve.
Gentle power maintains vehicle balance and directional control without exceeding tire adhesion limits.

Key Concept

Pre-entry deceleration and traction management on curves
Estimated Time:1m 0s
Rate this question

Topics

Speed on Curves and Downgrades

More questions from this topic