Alcohol or drug impairment affects driving by causing which of the following?

• A. Slower reaction time, impaired judgment and coordination, reduced perception, and higher crash risk.
• B. Faster reaction time and improved perception.
• C. No significant effect on driving ability.
• D. Only a minor delay in reaction time but no risk change.

Answer: (A)

Alcohol or drug impairment slows brain processing and reduces your ability to pay attention, react, and control the vehicle. That means your reaction time to hazards is longer, so you brake or steer slower than needed. Judgment suffers, so you misjudge gaps, speeds, or distances and may take unsafe risks like following too closely or speeding. Coordination is affected, making it harder to stay in your lane, steer smoothly, and perform precise maneuvers. Perception can also be diminished, with blurred vision or narrowed attention, so you might miss signals, signs, or changing traffic. All of these changes raise the chance of a crash.

Options claiming faster reaction time, improved perception, no significant effect, or only a minor delay without risk don’t fit because impairment from alcohol or drugs consistently reduces reaction speed, decision making, motor control, and situational awareness, increasing crash risk.