What situation might require a driver to abandon the posted speed limit?

Abandoning the posted speed limit may be necessary in poor traffic conditions due to safety concerns and the potential for accidents. When traffic is congested or unpredictable, it is crucial for a driver to adjust their speed to match the flow of traffic and respond appropriately to the surrounding environment. This might involve slowing down significantly, even if it means going below the posted limit, to maintain safe stopping distances and avoid collisions. Drivers should always prioritize safety over adhering strictly to speed limits, especially when external conditions pose additional risks.

The other scenarios outlined do not provide sufficient justification for adjusting speed limits. Good weather conditions typically allow for safer driving at or near posted limits. Traveling on a freeway generally implies a need to observe higher speed limits suited to highway travel, and a driver's confidence does not account for external factors that may warrant slowing down.