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Question

Difficulty: EasyBrake Failure

When descending a downgrade, an operator experiences severe brake fade and realizes the service brakes are no longer slowing the vehicle. A designated runaway truck escape ramp is located half a mile ahead. What is the safest action for the driver to take?

  1. A
    Bypass the ramp and continuously pump the overheated service brakes to rebuild friction.
  2. B
    Shift the transmission into neutral and engage the retarder at maximum capacity.
  3. Steer the commercial vehicle onto the escape ramp to bring it to a safe stop.Answer
  4. D
    Stay on the main roadway and attempt to coast to a stop on flat terrain beyond the grade.

Answer

Steer the commercial vehicle onto the escape ramp to bring it to a safe stop.
Escape ramps are specifically designed to stop runaway commercial vehicles safely when service brakes fail on downgrades. Utilizing an available escape ramp prevents severe collisions, rollovers, and property damage.

Step-by-Step Solution

1
Identify the loss of service braking capability and recognize the immediate availability of an escape ramp.
Driver confirms brake fade cannot slow the vehicle on the current slope.
Recognizing total brake loss early allows sufficient time to align the vehicle with the ramp entrance.
2
Guide the runaway vehicle smoothly into the escape ramp lane.
The vehicle enters the arrestor bed or incline safely.
Escape ramps are specifically engineered with loose aggregate or inclines to decelerate runaway heavy vehicles without rollover.

Key Concept

Runaway Truck Escape Ramp Utilization During Brake Failure
Estimated Time:45s
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Topics

Brake Failure

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