While it is obvious that speeds must be limited to the conditions, I've always been reluctant to throw out numbers, because the number needs to be based on things like sightlines, weather, and traffic. Plus, It's not practical to put signage for every route, no one wants to see Winni covered with speed limit bouys.
M-n-M can do math and figure out the absolute maximum safe speed, I'm too lazy. I'm sure it's a pretty big number, but that speed would only be safe in certain conditions. He could also do the math for worst case conditions, but that number would be impossibly small.
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