Speeds should be reduced below the posted speed limit for which of the following reasons?

Regardless of the posted speed limit, weather and traffic conditions may make it necessary to drive more slowly. A driver must take care to slow down when approaching and crossing an intersection, going around a curve, approaching the top of a hill, or traveling on a narrow and winding roadway. A driver must be aware that there may always be dangers present due to pedestrians, traffic, weather, mechanical problems, or road conditions.