[_heimdall]

> Assuming that the survival rate is constant as a function of trip length

That's an assumption that doesn't hold up, at least that's the argument I was trying to make above.

Generalizing so much data down to a single statistic makes the number useless. Almost all context is lost, really the only context kept is mode of transportation and distance traveled. That isn't enough to help anyone make a decision for any particular trip.