question it is dangerous and illegal to drive the posted speed limit. when the weather or other conditions…

Answer:

when the weather or other conditions make it hazardous to drive that fast

Brief Explanations:

Posted speed limits are maximum safe speeds for ideal conditions. When weather (like rain, snow) or other hazards (construction, poor visibility) exist, driving at the posted limit becomes unsafe and illegal in most jurisdictions, as drivers must adjust speed to conditions. Driving at the posted limit is legal and generally safe on highways or in cities under normal conditions.