What does every 0.02 increase in blood alcohol concentration do to the risk of being in a fatal crash?

• A. Increases by 10%
• B. Doubles it
• C. Triples it
• D. Increases by 50%

Answer: (B)

Small increases in BAC dramatically raise crash risk because alcohol impairs reaction time, judgment, coordination, and vision. A common rule in driver education is that for every 0.02% increase in BAC, the risk of a fatal crash roughly doubles. So moving from 0.00 to 0.02% doubles the risk, and each additional 0.02% increase doubles it again, making the danger grow quickly as BAC rises. The other options underestimate the effect at this level.