What is a common effect of fatigue on driving?

Fatigue significantly impacts a driver's ability to perform tasks related to driving effectively. One of the most common effects is decreased alertness. When a driver is fatigued, they may struggle to remain attentive to the road, surrounding vehicles, and changing conditions. This lack of alertness can lead to slower recognition of hazards, reduced awareness of their environment, and an increased likelihood of missing important cues necessary for safe driving.

In contrast, the other options present effects that are not associated with fatigue. Enhanced concentration and improved decision-making abilities are typically associated with being well-rested and alert, not fatigued. Similarly, increased reaction time is not a benefit of fatigue; rather, it is often the case that reaction times are significantly slower. The combination of decreased alertness and slower reaction times under fatigue increases the risk of accidents on the road, emphasizing the importance of being well-rested before driving.