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Not sure what you mean by, the rest of your life, driving a bit slower to save lives is a fraction of your life spent. I guess there's probably some moral equation being levied when people decide speed limits, but it probably has more to do with minimizing deaths rather than comparing the value of time.

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It's just an extreme example to show that time and life both have comparable value.

Speed limits have an implicit value comparison. If you want to minimize dwaths you could ban all modes of transportations or set a 1 mph speed limit, but we value our economy and time more than the amount of deaths caused by higher speed limits.

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