The Florida manual gives an average perception time for an alert driver. What range does it list?
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A.
Less than a quarter of a second for a healthy adult driver.
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B.
One to two seconds total for the driver to process the hazard.
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C.
Two to three seconds under favorable weather conditions.
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D.
Three-quarters of a second to one second. Correct
The answer is "Three-quarters of a second to one second."
The manual gives three-quarters of a second to one second as the average perception time for an alert driver. The one-to-two-second answer tempts readers combining perception and reaction into one figure, since the manual lists the same three-quarters-to-one-second range for reaction time on the very next line.
The traps in the wrong answers
A. Less than a quarter of a second for a healthy adult driver.
Well under the range the manual states. This answer uses a common reflex-testing figure from health class instead of the driving figure.
B. One to two seconds total for the driver to process the hazard.
This adds perception and reaction time together, which the manual keeps separate. This answer combines perception and reaction into a single figure the manual splits into two.
C. Two to three seconds under favorable weather conditions.
Two to three seconds is longer than either figure the manual prints. This answer borrows from the older two-second following-distance rule to guess perception time.
This question tests your knowledge of Defensive Driving in Florida. Source: Florida Driver Manual, "Driving Safety: Braking Distance," p.60..
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