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Difficulty: HardSteering Techniques

A commercial motor vehicle driver traveling at highway speed must maneuver around a sudden stationary obstruction in the lane where stopping distance is insufficient. In what chronological sequence should the driver execute the proper steering and vehicle control actions to navigate the hazard safely?

  1. 1Maintain a balanced two-hand hold on opposite sides of the wheel rim without applying the service brake.
  2. 2Input a smooth, limited steering angle just sufficient to guide the front tires past the hazard.
  3. 3Execute a prompt countersteer in the reverse direction the moment the vehicle clears the obstacle to control yaw.
  4. 4Center the steering wheel to align the vehicle with the new travel path prior to initiating any braking.

Answer

The correct sequence begins with maintaining a firm two-hand grip on opposite sides of the steering wheel without braking, followed by applying minimal steering to clear the obstacle, executing an immediate countersteer once past the hazard, and finally centering the steering wheel before any braking.
Safe emergency steering requires a precise procedural sequence: the driver must first secure firm two-handed control without touching the brakes, apply the minimal steering input required to pass the hazard, countersteer immediately upon clearing the obstruction to prevent excessive yaw, and re-center the steering wheel before applying any service brakes.

Step-by-Step Solution

1
Maintain a two-handed grip on opposite sides of the steering wheel and keep off the service brake.
Maximum directional control is established, and the front tires retain full lateral traction without locking.
Braking while turning heavy commercial vehicles readily induces loss of steering control and jackknife skids.
2
Steer smoothly with only the minimum deflection needed to clear the obstruction.
The vehicle changes heading with minimal body roll and tire scrub.
Excessive steering angles increase lateral acceleration and elevate rollover risk.
3
Countersteer in the opposite direction immediately as the vehicle clears the obstacle.
Angular momentum is counteracted, bringing the vehicle parallel to the roadway.
Delaying the countersteer causes the vehicle to swing too far in the initial turn direction, leading to a spin-out.
4
Straighten the steering wheel to center the vehicle in the clear path before initiating controlled braking.
The vehicle achieves stable, straight-line tracking, restoring full longitudinal braking efficiency.
Service brakes should only be applied once the vehicle is stabilized and aligned.

Key Concept

Evasive Steering and Countersteering Sequence
Estimated Time:1m 30s
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Topics

Steering Techniques

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