What type of driving conditions require a reduction in speed?

Driving in rain, snow, and icy conditions necessitates a reduction in speed due to the increased risks associated with these weather conditions. When roads are wet or icy, the friction between the vehicle's tires and the road surface is diminished, which can lead to skidding and longer stopping distances. Reducing speed allows a driver to maintain better control of the vehicle and react more effectively to sudden changes in the road conditions or to the actions of other drivers. Additionally, lower speeds provide more time to assess and respond to potential hazards, such as obstacles or other vehicles that may also be affected by the adverse conditions.

Clear and dry conditions, sunny weather, and heavy traffic may not necessarily require a speed reduction; in fact, clear conditions typically allow for safer driving at higher speeds, while heavy traffic might naturally regulate speed regardless of weather. However, rain, snow, and ice impose unique challenges that warrant caution and a strategic decrease in speed for safety.