Obviously you left out any factors about living and dying. Probably makes the calculations too hard.....or too easy.
I'd like to clarify not ever supporting the 70's 55 speed limit on this thread, but just observing that many drivers have a problem observing ANY speed limit - period. Many experience other drivers going full throttle for no reason at all. On this thread, there were obvious outbursts of defensive speeders. I'd like you to see this video. Afterwards, I dare anyone to declare a lifestyle of speeding/aggressive driving reduces what happens on this video, make a diversion on the thread, or a personal attack. I don't discount someone will feel so entitled to drive as they please anyway.