The posted speed limit shows:

The maximum safe speed under all road conditions.
The maximum safe speed under ideal road and weather conditions.
The speed at which you must travel to effectively deal with tailgaters.
The minimum legal speed limit.
Explanation

The posted speed limit indicates the maximum legal speed you can drive on a road under ideal road and weather conditions. Remember that this is not a recommendation to drive at that speed, but rather the maximum allowed speed. When weather conditions are less than ideal, such as during rain, snow, or ice, you may need to drive slower than the posted speed limit to ensure your safety and the safety of others on the road.

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