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Difficulty: MediumStopping and Braking Procedures

A heavy vehicle operator traveling on a two-lane highway detects a sudden road obstruction and must perform a controlled stop that involves steering into an adjacent clear lane to evade collision. Arrange the following procedural actions in the correct chronological sequence to stop safely without locking the wheels or losing directional steering control.

  1. 1Apply firm service brake pressure just short of wheel lockup while keeping the steering wheel straight.
  2. 2Release the brake pedal completely prior to initiating a significant steering adjustment.
  3. 3Turn the steering wheel smoothly to guide the commercial vehicle into the clear path with rolling tires.
  4. 4Straighten the vehicle in the new lane and reapply maximum firm brake pressure without wheel lockup until stopped.

Answer

The proper sequence begins with straight-line threshold braking just short of lockup, followed by releasing the brake pedal, executing the steering maneuver with rolling tires, and finally straightening the vehicle and reapplying firm braking pressure to complete the stop.
In commercial vehicle controlled braking maneuvers requiring evasive steering, drivers must maximize deceleration in a straight line, fully release brake pressure before turning so rolling tires can steer, steer around the hazard, and then straighten the wheels before reapplying firm braking pressure to complete the stop.

Step-by-Step Solution

1
Apply heavy braking pressure without locking wheels while maintaining a straight trajectory.
Vehicle decelerates rapidly while retaining stability along its initial path.
Straight-line threshold braking dissipates maximum speed before directional maneuvering becomes necessary.
2
Completely release the service brake pedal before turning the wheel.
Tire friction is fully dedicated to lateral cornering force rather than longitudinal braking force.
Locked or heavily braked front wheels cannot produce adequate steering response.
3
Steer into the open lane while all wheels roll freely.
The vehicle maneuvers around the obstruction smoothly without skidding or jackknifing.
Rolling tires maintain the traction required for precise steering control.
4
Countersteer to straighten the vehicle in the clear lane and reapply firm threshold braking.
The commercial vehicle comes to a complete, controlled stop in the safe lane.
Reapplying brakes only after straightening prevents lateral sliding or vehicle instability.

Key Concept

Controlled Braking and Steering Coordination
Estimated Time:1m 15s
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Topics

Stopping and Braking Procedures

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