JJ Keller Entry Level Driver Training for CDL (Commercial Driver’s License) Practice Test 2026 - Free CDL Practice Questions and Study Guide

Alcohol can slow reaction time, which is a critical factor in driving safely. When alcohol enters the bloodstream, it impacts the central nervous system and can impair a person's ability to respond quickly to visual and auditory cues while driving. This delay in reaction time can lead to an inability to react appropriately to sudden changes on the road, such as another vehicle stopping abruptly or a pedestrian crossing unexpectedly.

The other statements reflect misunderstandings of the effects of alcohol. While alcohol can affect various cognitive functions, it does not enhance reaction time, and it certainly does impact driving ability negatively. Additionally, the claim that alcohol affects only short-term memory overlooks the broader cognitive impairment that can occur, influencing judgment and decision-making, which are essential for safe driving. Understanding the effects of alcohol on the body helps emphasize the importance of sober driving to ensure safety for oneself and others on the road.