A posted speed limit of 55 mph means:

Under poor weather conditions, you should travel at a maximum speed of 55 mph.
Under ideal conditions, you should travel at a maximum speed of 55 mph.
Under ideal conditions, you should travel at a minimum speed of 55 mph.
Under poor visibility conditions, you should travel at a maximum speed of 55 mph.
Explanation

A maximum speed limit sign indicates the highest speed you are legally allowed to travel under ideal conditions, such as clear weather and good road surface. It is illegal to exceed the posted speed limit. However, you are allowed to drive slower than the limit if weather, road conditions, or other factors make it unsafe to drive at the posted speed.

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