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Many speed limits are set so that you can still drive the road in adverse conditions.
This is not true. There may be some statutes in some jurisdictions with language that may suggest something like this is done, but the truth is, all speed limits were originally set by simply measuring how fast people drive, averaging all the number together, then reducing that number by 20%. From there, how it's changed over the years depends on where you are (with the exception of the nation-wide speed limit of 55 mph in response to the oil crisis in the 70s) but all of them started completely arbitrarily.
It's also worth mentioning, car technology is such that a modern cars only needs about 40% the stopping distance of a vehicle made when the speed limit was decided upon. So, not only are they arbitrary, but if they truly were based on vehicle performance, they would be a lot higher today (at least on rural roads. City streets are another story).
Or you are just repeating myths...
https://www.ite.org/technical-resources/topics/speed-management-for-safety/setting-speed-limits/
Oh, sure, fall for Big Transportation's story... /s