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Lumifer comments on Low Hanging fruit for buying a better life - Less Wrong Discussion
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But in certain places the optimal speed to drive at (i.e. minimizing some linear combination of probability of dying, time spent, fuel used, etc.) may exceed the legal speed limit (i.e. maximizing revenue from speed tickets).
Then again, going fast and then braking right before a radar may itself be quite dangerous.
I'll make a stronger claim: in many places (e.g. US highways) the optimal speed to drive does exceed the legal speed limit for the simple reason that the probability of an accident is a function of the difference between your speed and the speed of the traffic around you, and the traffic on interstates generally goes faster than the speed limit.
On the other hand I've never been pulled over when doing the same speed as cars around me, and I've been speeding for over a decade at this point.