How are speed limits calculated?
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I had a relative who worked in a city taffic department. He described experiments they did. For example, they build a variety of different speed bumps and hired stunt drivers to go over them at different speed in both cars and motorcycles. Oh, and hook-and-ladder firetrucks too. He taught me that for many speed bumps, they get worse and worse until you hit a certain speed, and then they start getting better again. This isn’t a recommendation, of course.
I can’t remember all of his stories, but I got the sense it was more about experiments and experience than about calculations. That was a long time ago, so it may be different now.
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