Tennessee Class D Knowledge Test Practice
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Passing target: 80% (32/40)
A ball rolls into the street ahead. You see it and recognize the danger. Then your foot moves from the gas pedal to the brake pedal. What is the distance that your car travels while your foot moves to the brake?
A has recognized danger from a ball in the street and the driver moves a foot to the brake. A small physical ball has a labelled detail inset.
Correct answer: Reaction distance
Why
Total stopping distance has three parts: perception (you see and recognize the danger), reaction (your foot moves to the brake) and braking (the brakes stop the car). The car keeps its full speed during the first two parts. In the manual's example at 70 mph, a driver travels about 128 feet before braking starts and about 418 feet in total, so plan your speed and space for all three parts.
Verified against Tennessee Comprehensive Driver License Manual · Stopping Distances — Perception, reaction, and braking · p. 63
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