[josephcsible]

> Bonus points for rationalizing this behavior "because it's safer to go at the speed of traffic!".

But that's true (look up the Solomon curve), and it's exactly why the 85th percentile would be better.

> Delusional rationalizations like "if the limit is 50 then going 10 over must be fine too, due to <reasons>!". Bonus points for applying the "5/10/15/20 over" rule for every possible speed limit — basic maths and physics say hello!

You have cause and effect backwards. People think it's safe to go over the speed limit precisely because most speed limits are too low.

> Changing speed limits has little effect compared to changing the physical infrastructure. Show me a picture of a road and I'll tell you how fast people will drive on it.

Right. So even if going slower is safer, just making the speed limit lower won't accomplish that.

[fc417fc802]

I'll agree with you regarding major arterials but disagree when it comes to suburban neighborhoods. What feels safe from the perspective of someone operating a vehicle can be quite different than what's actually safe when there are pedestrians and cars unexpectedly popping out of driveways.

[josephcsible]

> What feels safe from the perspective of someone operating a vehicle can be quite different than what's actually safe when there are pedestrians and cars unexpectedly popping out of driveways.

That's all the more reason to raise speed limits on the major roads. Speed limits being more reasonable there makes it more likely that drivers would abide by them even on those smaller residential streets.