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Question

Difficulty: EasySpeed on Curves and Downgrades

A commercial motor vehicle driver is traveling on an open highway and observes a warning sign indicating a sharp curve ahead. What is the correct chronological sequence of actions the driver must take, from first to last, to safely manage speed and navigate the curve?

  1. 1Recognize the warning sign and evaluate the curve advisory speed while on the straight approach.
  2. 2Apply the service brakes to decelerate below the advisory speed limit while still traveling in a straight line.
  3. 3Downshift to the proper low transmission gear before steering into the curve.
  4. 4Apply gentle, steady throttle through the curve to maintain vehicle stability.

Answer

The proper procedure begins with recognizing the warning sign on the approach, decelerating on the straightaway before the turn, downshifting to the correct gear prior to entry, and applying gentle acceleration through the curve.
Safe curve negotiation requires completing all deceleration and downshifting on the straight roadway before turning. Once the vehicle enters the curve, the driver maintains slight, steady throttle to pull the vehicle through safely.

Step-by-Step Solution

1
Assess the upcoming curve and advisory speed limit.
Driver identifies the need to reduce speed well in advance.
Commercial vehicles require significantly longer distances to adjust speed safely before changes in road alignment.
2
Brake to a safe speed below the advisory limit while vehicle is oriented straight.
Speed is controlled prior to the lateral forces of the turn.
Braking inside a curve can overcome tire traction and trigger an immediate jackknife or rollover.
3
Select the correct gear before entering the turn.
Drivetrain remains engaged without disengaging the clutch mid-curve.
Shifting or coasting through a curve reduces directional control and destabilizes the vehicle.
4
Maintain slight power through the turn.
Drive wheels maintain positive traction through the apex and exit.
Gentle acceleration stabilizes vehicle weight distribution and pulls the combination steadily through the curve.

Key Concept

Pre-curve speed reduction and power management for commercial vehicle stability.
Estimated Time:45s
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Topics

Speed on Curves and Downgrades

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