What do speed limit signs represent?

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Speed limit signs set the maximum legal speed you may travel on that road under normal driving conditions. They establish the upper limit to help keep traffic safe and predictable, so the best description is the maximum speed for typical conditions. It isn’t a minimum speed you must meet, and it isn’t a blanket recommendation for heavy traffic. The limit applies in all weather, though you should slow further for rain, fog, or hazards when conditions warrant. If conditions are poor, decrease speed even more, but never exceed the posted limit.