What effect does yawning frequently while driving indicate?

Frequent yawning while driving is a strong indicator of fatigue. Yawning is a physiological response often associated with tiredness, as it can signal that the body is lacking adequate rest or sleep. When a driver is feeling fatigued, their concentration, reaction times, and overall awareness can significantly diminish, increasing the risk of accidents. In this context, recognizing this sign is crucial for maintaining safety on the road; it serves as a warning to the driver that they may need to take a break, rest, or find alternative transportation.