In what condition should a motorcyclist reduce speed more than usual?

A motorcyclist should reduce speed more than usual in wet or slippery conditions because these environments significantly affect traction and handling. When the road surface is wet, there is an increased risk of losing grip, which can lead to skidding or loss of control if the motorcycle is traveling too fast. Slippery conditions may arise from rain, oil spills, or debris on the road, and a slower speed allows for better reaction time, greater stability, and the ability to maneuver safely in such unpredictable scenarios.

In contrast, while heavy traffic does require cautious riding and possibly reduced speed, the risks associated with loss of control are more pronounced in wet conditions. Riding in the evening may simply involve reduced visibility, which doesn’t necessarily call for a major reduction in speed unless conditions are additionally compromised by weather. Riding on straight roads does not inherently present special hazards that would necessitate a reduction in speed, provided no other factors are at play.