The speed limit signs show the start & finish lines of the actual speed limit. In other words, you must not be exceeding the limit as you pass the sign. It is a fact that the majority do exceed the limit there, only slowing down afterwards (caveat - that obviously includes those that don't bother, we aren't talking about those here).
I come from a railway background, where every inch of track (even including sidings) has a speed limit applied and enforced. (Mainly for technical reasons including derailments). Although not a train driver, I've done enough cab rides to appreciate the limits and how they are enforced (most trains have black boxes nowadays, and they do employ radar traps). I've just got used to using the same techniques in my road driving - look at the road ahead, anticipate & slow down BEFORE the sign (and then similarly coming out of the limit, don't accelerate until passing the sign). Sounds boring I know, but that is how it works.
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