Braking Distance - Florida DMV Practice Test and Answers

Permit Practice Test Braking and Braking Distance Formula.

This practice test on Braking and Braking Distance will let you know if you are ready to take the permit test for your Florida Learner Permit or Drivers License. Before you take this test you should have reviewed the Braking Videos and Tutorials.

Below are questions about Braking and Braking Distance in the form of multiple choice just like on the Florida Permit Test. As you answer each question you will learn the correct answer so you can learn by taking the test.

1. You’re driving down the highway at 50 mph and you see a car with hazard lights on in the road with people trying to push it off the road. How far will your car travel before you realize you need to stop?

Incorrect: Please try again.

Correct: It will take 3/4 of a second to 1 second for your brain to register that you must stop. This is Perception Distance, which is the time from when you see the hazard until your brain registers. At 50 mph that translates to 55 feet.

2. What is the best way to avoid being hit from behind when you stop your car?

Incorrect: Please try again.

Correct: Taking your foot of the gas will start to slow your car and you will come to a smooth stop with steady brake pressure.

3. At 50 mph what is your total stopping distance?

Incorrect: Please try again.

Correct: At 50 mph, your total stopping distance is at least 268 feet. The 268 feet is the combination of: 55 feet for Perception, 55 feet for Reaction, and 158 feet for braking.

4. If you double your speed from 20 mph to 40 mph, how does that effect your total stopping distance.

Incorrect: Please try again.

Correct: When you double your speed from 20 to 40 mph your braking distance and force of impact are 4 times greater. Triple your speed from 20 to 60 and your braking distance and impact are 9 times greater. Quadruple your speed from 20 to 80 mph and your braking distance and impact are 16 times greater.

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