Driver's License Test Prep
Texas Practice Defensive Driving

According to the manual, how long does the average person take to think, react, and apply the brakes?

  1. A.
    Under one second on average
  2. B.
    Roughly three seconds
  3. C.
    About a second and a half Correct
  4. D.
    Half a second on average
The Why

The answer is "About a second and a half"

The Approximate Stopping Distances page opens by telling drivers it takes the average person one and a half seconds to think, react, and apply the brakes, and the whole stopping table is built on that count. Rounding the figure down to a clean whole number is the mental shortcut behind A, the sort of quick estimate drivers reach for on the fly.

Why the others miss

The traps in the wrong answers

A. Under one second on average

The manual gives a longer time than one second. This answer rounds the actual figure down to a clean whole number, the mental shortcut drivers reach for when estimating on the fly.

B. Roughly three seconds

This overshoots the manual's figure by double. This answer blends the reaction-time figure with the four-second following interval printed nearby in the speed guidance.

D. Half a second on average

The manual's average is three times that long. This answer uses the fast-reflex figure some drivers assume they hit; the manual averages across all drivers, not the quickest ones.

The Rule

This question tests your knowledge of Defensive Driving in Texas. Source: Texas Driver Manual, "Approximate Stopping Distances," p.45..

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