Roger Knowles discovered this very simple mathematically significant road sign in his home stomping grounds.
Mr. Knowles was a little embarrassed by the simplicity of the math, but he was happy to take the points.
\sqrt{4} = 2
This sign is found in California I-80 westbound at the Cummings Skyway exit. The GPS coordinates are approximately N38.04325 W122.24038. See sign on map!
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