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Speed limits are designed for suboptimal road conditions. Since dynamic speed limits weren't even possible until relatively recently, they figured out how quick you could safely travel on a road when it is nice, and again when it's crappy, and set it somewhere between those values.
Wait, they are like that in the US? In many European countries (I know it's the case in France), the speed limit is explicitly for good weather, and there's a lower limit when it's raining for example (highway is 130/110 km/h, but in rain conditions the limits are 110/100 km/h)
No they’re not designed for some average they are for “good conditions”. I live in the US in the Pacific Northwest where it rains a lot and a big part of learning to drive here is that yes, you do need to slow down when it rains the speed limit is often not safe when your stopping distance gets extended by wet roads.
Bad conditions would still because allowing down from the average... That's how math works.
That sounds like something drivers tell themselves to justify speeding. Any source on that?
All engineering is built around tolerances. You don't build something that just barely handles the expected use case, you as a significant buffer.