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I have noticed certain signs with curve symbols and a lower speed limit posted directly below the sign. How is this speed limit established?

April 26, 2017certain curve directly limit lower noticed posted signs speed Symbols

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I have noticed certain signs with curve symbols and a lower speed limit posted directly below the sign. How is this speed limit established?

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The speed limit posted under any warning sign is called an “advisory” speed limit. It informs motorists of the recommended safe speed for the design of the roadway. The appropriate speed is determined through the measurement of centrifugal forces (as exerted upon the driver) when driving through the curve at various speeds. Using this information, the recommended maximum speed can be determined and posted accordingly.