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Difficulty: EasyEvasive Steering and Avoiding Collisions

During an emergency avoidance maneuver where you must steer quickly around a sudden road obstruction, why is it critical to stay off the brake pedal while making the turn?

  1. Applying the brakes while turning sharply can lock the wheels and cause a skid, resulting in loss of steering control.Answer
  2. B
    Braking forces the drive wheels to automatically steer opposite to the intended direction of travel.
  3. C
    Braking immediately increases steering wheel free play beyond allowable mechanical limits.
  4. D
    Braking increases driver perception time and reaction distance during the maneuver.

Answer

Applying the brakes while turning sharply can lock the wheels and cause a skid, resulting in loss of steering control.
According to official commercial driving standards, a driver should not apply the brakes while turning sharply to avoid an obstacle. Braking while making an evasive turn can easily lock the wheels, causing the vehicle to skid and stripping the driver of all steering control.

Step-by-Step Solution

1
Identify the primary physical dynamic of commercial vehicle evasive maneuvers.
Steering requires tire traction to generate lateral cornering forces.
Tires provide maximum steering capability when they are rolling freely rather than sliding or locked under braking.
2
Determine the effect of brake application during a sharp turn.
Simultaneous hard braking and sharp steering overtaxes available traction, locking the steer or drive wheels.
Locked tires slide in a straight line regardless of steering wheel angle, eliminating directional control.
3
Select the correct CDL emergency steering procedure.
Keep feet off the brake until the steering maneuver and counter-steer are complete and the vehicle is straight.
Ensures full tire grip remains dedicated to collision avoidance before deceleration is initiated.

Key Concept

Evasive Steering Traction Management and Wheel Lockup Prevention
Estimated Time:45s
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Topics

Evasive Steering and Avoiding Collisions

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