Which of the following substances is commonly associated with driver impairment?

Both alcohol and marijuana are well-recognized substances that can significantly impair a driver's ability to operate a vehicle safely. Alcohol affects cognitive functions, coordination, and reaction times, leading to decreased judgment and increased likelihood of accidents. Similarly, marijuana impairs motor skills, reaction time, and the ability to concentrate, making it dangerous for drivers as well.

When both substances are combined, the effects can be even more pronounced, leading to greater risks on the road. Therefore, the acknowledgment that both alcohol and marijuana are associated with driver impairment underscores the importance of avoiding these substances before driving to ensure safety for oneself and others. Recognizing the dangers of both enhances the understanding of responsible driving behavior and the laws surrounding driving under the influence.