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Ohio TIPIC / Class D Knowledge Practice Test
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Observation, Speed & SpaceStandalone practice
At 50 mph on dry pavement, a car with good brakes can need about 158 feet just to brake. You now drive at 65 mph instead. What happens to your total stopping distance?
Correct answer: Both the reaction distance and the braking distance grow.
Why
Stopping distance has three parts: perception, reaction and braking. An alert driver needs about three-quarters of a second to 1 second to notice a hazard and about the same time to move to the brake, and the car keeps moving the whole time. Because the total grows so quickly with speed, you need a larger space cushion on fast roads.
Verified against Ohio Driver Manual · Stopping distance · p. 34
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