this post was submitted on 18 Jul 2025
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I've encountered a few roads in my time driving where the speed limit doesn't match actual driving conditions at all.
I think by now we should have the technology to do statistical analyses on actual road data (currently observed speed vs. speed limit speed) to more accurately assign speed limits that are safe enough that enough people actually follow them.
@Gork @three_trains_in_a_trenchcoat
My understanding is, when they design a road they do calculate the "engineering speed limit", the safe speed given road geometry and surface and visibility, etc., but then they mostly ignore it and assign an arbitrary limit from the standard list for that type of roadway.
We botched raising the limit for 400-series. We should have gone to 120km/h with actual enforcement, but what we did was 110 and a wink, and now 1 in 3 drivers do 130km/h.