For every 2 miles driven, what is the approximate ratio of observations to mistakes?

• A. 100:1
• B. 200:1
• C. 20:1
• D. 2:1

Answer: (B)

Active observation is essential for safe driving. You’re constantly scanning the road, using mirrors, checking signs, and anticipating hazards. The idea behind the ratio of observations to mistakes is that you should notice and respond to potential problems far more often than you make errors. In practice, a high ratio like about 200 observations for every mistake reflects that careful, continuous scanning dramatically reduces mistakes. So the best choice, 200:1, fits the reality that you'd encounter many cues and potential hazards in a short drive, with mistakes being relatively rare. The other options would imply far fewer observations per mistake, which isn’t consistent with how attentive driving should work.