What is a common effect of fatigue while riding a motorcycle?

Fatigue significantly impacts a rider's ability to respond to situations on the road. When a motorcyclist is fatigued, their physical and mental abilities are compromised, leading to slower reaction times. This means that even in situations where quick responses are crucial—such as avoiding an obstacle, reacting to a sudden traffic change, or responding to road conditions—the fatigued rider may not be able to act as swiftly or effectively as they would when well-rested.

In contrast, the other options describe states of heightened ability that are typically not associated with fatigue. Increased alertness, improved concentration, and heightened awareness of surroundings are qualities that are important for safe riding but can diminish significantly when a rider is tired. Fatigue can lead to a lack of focus and impaired judgment, making it more challenging to notice and react to potential hazards on the road.