What is the primary cause of physical fatigue while driving?

Physical fatigue while driving primarily stems from physical exhaustion, which can result from a variety of factors such as lack of sleep, prolonged physical activity, or even the strain from maintaining a particular posture while driving for an extended period. When a driver is physically exhausted, their ability to maintain concentration, reaction times, and overall alertness diminishes significantly, increasing the risk of accidents.

While mental or emotional stress, lack of interest in driving, and distractions inside the vehicle can certainly contribute to a driver's overall fatigue and diminished performance, they are more closely related to mental fatigue rather than physical fatigue. In contrast, physical exhaustion specifically addresses the bodily aspects that can lead to decreased stamina and alertness behind the wheel.