Final answer:
Alcohol impairs driving ability, even below the legal BAC limit. It affects physical coordination, judgment, and all physical and mental functions. The negative effects of alcohol on driving are due to its impact on the brain and nervous system.
Step-by-step explanation:
Alcohol significantly impairs a person's ability to drive even after consuming one or two drinks, well below the legal blood alcohol concentration (BAC) limit of 0.08%. This impairment affects physical coordination, judgment, and all physical and mental functions including the ability to walk and talk. The negative effects of alcohol on driving ability are due to its impact on the brain and nervous system, causing decreased reaction time, lowered alertness, and impaired motor skills.