Under what conditions can the posted speed signs be used safely?

The posted speed signs are intended to provide guidance on the maximum safe speed for driving under ideal conditions. Ideal conditions refer to clear weather, good visibility, and optimal road conditions, where drivers can maintain control and react appropriately to any hazards.

In ideal conditions, the posted speed limit is designed to ensure that drivers can safely navigate the roadway without undue risk to themselves or others. Speed limits are determined based on factors like road design, traffic patterns, and surrounding environments, all of which contribute to what is considered safe driving conditions.

Adjusting speed according to the conditions present, such as rainy weather or fog, is essential for safe driving, as these conditions can significantly affect traction and visibility. Therefore, only under ideal conditions can one confidently adhere to the posted speed signs without increasing the risk of accidents.