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Difficulty: EasyStopping Distance Components

A commercial driver operating a truck equipped with air brakes must understand all factors that determine how far the vehicle travels before coming to a complete stop. Which four distinct components combine to make up total stopping distance for an air-brake vehicle?

  1. A
    Following distance, reaction distance, brake lag distance, and braking distance
  2. Perception distance, reaction distance, brake lag distance, and braking distanceAnswer
  3. C
    Perception distance, reaction distance, and braking distance only
  4. D
    Perception distance, following distance, and braking distance

Answer

Perception distance, reaction distance, brake lag distance, and braking distance
For commercial vehicles equipped with air brakes, total stopping distance consists of four sequential parts: perception distance (distance traveled while recognizing the hazard), reaction distance (distance traveled while moving the foot to the pedal), brake lag distance (distance traveled while air pressure builds up in the brake chambers), and braking distance (distance traveled while the friction of the brakes slows and stops the vehicle).

Step-by-Step Solution

1
Identify the brake system type specified in the scenario
The vehicle is equipped with air brakes, which introduces a pneumatic delay known as brake lag.
Air brakes take approximately one-half second for air to flow through the lines and push the brake shoes against the drums.
2
Combine the human latency and mechanical latency phases to determine total stopping distance
Total Stopping Distance = Perception Distance + Reaction Distance + Brake Lag Distance + Braking Distance.
Total stopping distance encompasses everything from the moment the hazard is seen until the vehicle comes to a complete physical halt.

Key Concept

Air Brake Total Stopping Distance Formula
Estimated Time:45s
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Topics

Stopping Distance Components

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