What are signs that a driver may be drowsy while driving?

When assessing signs that a driver may be drowsy while behind the wheel, frequent yawning and drifting out of lanes are key indicators. Yawning often signals fatigue, as it is a physiological response to lack of sleep or alertness. Drifting out of lanes indicates a loss of focus and control, which is commonly associated with drowsy driving. When a driver is becoming drowsy, their ability to maintain a steady course diminishes, leading to potential lapses in attention to the road and surroundings.

The other scenarios presented do not specifically indicate drowsiness. Increased speed and aggressive behavior may point more to excitement or distraction, rather than fatigue. Using a phone and eating might suggest distraction but not necessarily drowsiness, as they involve active engagement rather than the lethargy associated with being tired. Similarly, listening to loud music and looking around can indicate an attempt to stay alert but does not directly relate to signs of drowsiness. Addressing the specific signs of drowsiness is critical for understanding the risks associated with driving while fatigued.