A 3-minute lesson from the Florida course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.
Stopping takes much longer than it feels. Your car keeps moving while your eyes spot a hazard, while your brain decides to brake, and while the brakes slow you. Speed makes every part longer, and braking distance grows fastest.
Perception distance
How far you travel, in good conditions, from when your eyes see a hazard until your brain recognizes it. Affected by your condition, medication, visibility and the hazard itself.
At 50 mph a child runs into the road 200 feet ahead. Even an alert driver needs a minimum of 268 feet to stop, so you would still be moving when you reach the child. That is why speed near schools and neighborhoods matters so much.
Check your understanding
Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.
What is the average perception time for an alert driver to recognize a hazard?
Under 1/4 second
2 to 3 seconds
5 seconds
3/4 to 1 second
Answer: 3/4 to 1 second
The average perception time for an alert driver is 3/4 second to 1 second.
