I'm sort of sympathetic to that argument, but my observation has also been that most drivers are terrible at judging safe speeds for a given road. They go way too slow when they don't need to (a gentle curve on a highway) and drive way too fast for conditions at other times (a narrow twisty two lane road with blocked sight lines and blind driveways).

Also useful to do stuff like make roads curved and add trees to the side.

A YouTube short I saw the other day about this concept: https://youtube.com/shorts/MyT7F5zuOU4

> add trees to the side

also great way to get someone killed if they meet one

But a good way to save pedestrians on the sidewalk

Ok kinda makes for city. We had outcry when some country roads were cleared out of trees. Each of them had a life on them.

Also visual narrowing, such as adding trees and light curves. People drive what they feel the road should be and mostly ignore speed limits.

Some towns deliberately post speed limits below what drivers would naturally go in order to set speed traps for revenue.