An operator driving an air-brake equipped commercial combination vehicle sees an unexpected hazard on the highway and executes a full stop. Arrange the sequential stages of the total stopping process in chronological order, from initial hazard observation to the vehicle coming to a complete standstill.
- 1Perception distance: The vehicle continues forward while the driver's eyes see the hazard and the brain recognizes the necessity to stop.
- 2Reaction distance: The vehicle travels forward during the time required for the driver to lift their foot from the accelerator and place it onto the service brake pedal.
- 3Brake lag distance: The vehicle travels forward during the fraction of a second required for air pressure to flow through lines and actuate the mechanical brake components.
- 4Effective braking distance: The vehicle decelerates as friction between the brake linings and drums or discs slows wheel rotation until forward motion ceases.
Answer
The correct chronological sequence begins with Perception Distance, followed by Reaction Distance, then Brake Lag Distance, and concludes with Effective Braking Distance.
Total stopping distance in an air-brake equipped commercial vehicle consists of four distinct chronological components: first, the cognitive awareness period (perception distance); second, the physical movement of the foot to the pedal (reaction distance); third, the aerodynamic delay of air traveling through pneumatic lines to force the brake shoes against the drums (brake lag distance); and fourth, the actual friction-based deceleration of the vehicle to zero speed (effective braking distance).
Step-by-Step Solution
Key Concept
Sequential Components of Total Stopping Distance in Air-Brake Commercial Vehicles
Estimated Time:1m 0s