JJ Keller Entry Level Driver Training CDL Practice Test 2025 – Comprehensive All-in-One Guide to Exam Success!

Both alcohol and prescription drugs can significantly impair driving abilities, making the combination of the two particularly dangerous. Each substance affects the central nervous system differently, but both can lead to reduced coordination, slower reaction times, and impaired judgment.

Alcohol is widely recognized for its impairment effects, influencing both cognitive functions and motor skills. Likewise, many prescription drugs can have sedative effects or alter perception, which can also impact a driver’s ability to operate a vehicle safely. For instance, opioids, benzodiazepines, and certain antidepressants can all contribute to drowsiness and decreased alertness, compounding the risks already presented by alcohol.

On the other hand, while caffeine can enhance alertness and may help counteract fatigue, its impact on driving ability is generally not as severe as that of alcohol and certain prescription drugs. Therefore, the most significant threat to driving capability arises from the combinations and effects of both alcohol and drugs, establishing the validity of the answer that highlights the dangers posed by both substances.