Examkin

Question

Difficulty: MediumSkid Control and Recovery

After pulling onto an expressway interchange with damp pavement and loose gravel, excessive acceleration causes the tractor's drive tires to spin and the rear chassis begins drifting sideways. Which response is the correct method to arrest the skid and re-establish directional control?

  1. A
    Turn the steering wheel in the opposite direction of the rear slide while maintaining steady engine power.
  2. B
    Depress the service brake pedal firmly while still negotiating the curve to force the vehicle to slow down.
  3. Release the throttle completely to allow the drive wheels to regain grip, and turn the steering wheel in the direction of the rear-wheel slide.Answer
  4. D
    Switch on the electromagnetic or exhaust retarder to rapidly decelerate the drive axle wheels.

Answer

Release the throttle completely to allow the drive wheels to regain grip, and turn the steering wheel in the direction of the rear-wheel slide.
To recover from a drive-wheel acceleration skid, the driver must immediately release the accelerator so the drive wheels can regain rolling traction. Simultaneously, the driver must steer in the direction the rear of the vehicle is sliding, followed by smooth counter-steering as the vehicle straightens to prevent a secondary skid in the opposite direction.

Step-by-Step Solution

1
Identify the cause of the skid as drive-wheel over-acceleration on a low-friction surface and immediately remove foot pressure from the throttle.
Drive wheels stop spinning freely and begin to re-establish rolling friction with the roadway.
An acceleration skid happens when drive wheels lose traction from excessive power; cutting power allows tire treads to grip again.
2
Turn the steering wheel in the same direction the rear of the vehicle is sliding, followed by prompt counter-steering as alignment is regained.
The front steer tires align with the path of the sliding rear chassis, preventing a spin-out or jackknife.
Steering in the direction of the skid counteracts rotational forces and guides the combination back into straight-line tracking.

Key Concept

Drive-wheel skid recovery and acceleration skid control on slippery surfaces
Estimated Time:1m 0s
Rate this question

Topics

Skid Control and Recovery

More questions from this topic