Which statement best describes how alcohol affects driving?

• A. Alcohol impairs judgment and makes you unaware of how much you have had.
• B. Alcohol improves your night vision.
• C. Alcohol speeds up reaction time.
• D. Alcohol has no impact on driving ability.

Answer: (A)

Alcohol affects driving mainly by impairing judgment and making you unaware of how much you’ve had. When you drink, your sense of control can feel intact, but your ability to assess your own level of impairment drops. That means you may underestimate risks, misjudge gaps, and take chances you wouldn’t otherwise consider, which is a dangerous combination behind the wheel.

At the same time, alcohol slows your reaction time and reduces coordination, so even if you notice a hazard, your ability to respond quickly is diminished. It can also dull vision, especially at night, by reducing contrast sensitivity and broad awareness of the surrounding area.

So the statement that best describes alcohol’s effect on driving is that it impairs judgment and makes you unaware of how much you’ve had. The other ideas—improving night vision, speeding up reaction time, or having no impact—do not fit the observed effects of alcohol on driving.