Which of the following is a possible effect of fatigue on a driver's performance?

Fatigue can significantly impair a driver's ability to operate a vehicle safely, and one of the direct effects is weakened observation skills. When a driver is fatigued, their cognitive functions decline, leading to decreased attention and reduced ability to notice critical details in the driving environment. This includes difficulty in spotting traffic signals, pedestrians, or even potential hazards, which can compromise safety on the road.

In contrast, the other options reflect positive effects that are generally not associated with fatigue. For instance, one does not experience enhanced reflexes, increased awareness, or better decision-making when tired; rather, fatigue slows reaction times, diminishes situational awareness, and leads to poorer judgments, all of which can lead to dangerous driving situations. Understanding the impact of fatigue can play a crucial role in promoting safe driving practices.