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Driving at the posted speed limit is not necessarily legal in all conditions, particularly when road or weather conditions are poor. The law emphasizes that drivers must always adjust their speed according to prevailing conditions, ensuring safety. This means if the conditions are hazardous—such as during heavy rain, snow, fog, or icy roads—driving at the posted speed limit could lead to unsafe situations and thus is not legal.

In these circumstances, even if the speed limit is posted as a maximum, drivers are expected to use their judgment to drive at a speed that is safe for the conditions, which may be below the posted limit. This principle reflects the importance of maintaining safety on the roads above merely adhering to numerical limits. Consequently, it's essential for drivers to be aware of their environment and modify their speed to suit it, thereby preventing accidents and ensuring their own safety as well as the safety of others.