A commercial driver operating an air-braked combination vehicle at () is maintaining exactly a -second following distance behind a lead vehicle. The lead vehicle strikes an immovable barrier and stops instantaneously. Assuming standard latency times (perception time of , reaction time of , and brake lag of ), what is the maximum mechanical braking distance the commercial vehicle can require to completely avoid a collision, and which components consume the rest of the available following distance?
- ; the remaining space is consumed by perception distance, reaction distance, and brake lag distance.Cevap
- B; the remaining space is consumed by perception distance and reaction distance only, as seen in hydraulic brake systems.
- C; the remaining space is consumed by reaction distance and brake lag distance, omitting perception distance.
- D; the remaining space is consumed by perception distance and brake lag distance, omitting reaction distance.
Cevap
The maximum allowable mechanical braking distance is ; the remaining space is consumed by perception distance, reaction distance, and brake lag distance.
To completely avoid a collision, the total stopping distance must be strictly less than the following distance (). For an air-braked vehicle, the pre-braking time is the sum of perception (), reaction (), and brake lag (), totaling seconds. During this latency, the vehicle travels (). Subtracting this pre-braking distance from the total available space leaves exactly for mechanical braking.
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Anahtar Kavram
Air Brake Total Stopping Distance Components