Which of the following can impair your ability to ride safely?

Fatigue and medication can significantly impair a rider's ability to operate a motorcycle safely. Fatigue can decrease alertness, slow reaction times, and impair judgment, making it difficult to respond appropriately to changing road conditions or hazards. Similarly, certain medications can cause side effects such as drowsiness, dizziness, or decreased cognitive function, all of which can further compromise a rider's skills. It is crucial for motorcycle riders to be aware of their physical and mental state, as well as any substances they may be taking, to ensure they can ride safely and effectively.

While good weather conditions promote safe riding by improving visibility and reducing hazardous road conditions, wearing sunglasses primarily enhances visibility against glare and riding with a passenger does not inherently impair a rider's ability if they are properly trained and able to manage the additional weight. However, both these scenarios do not directly affect a rider's physical and mental capacity in the way that fatigue and medication do.