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15 seconds danger zone / 72,000 seconds of driving = 1 in 4,800

Any reason you chose those numbers? Trying to understand the significance of those odds.

So sorry -- I think I got distracted while writing (doing things around the house) and got the math wrong :'(

I wanted something around 1:1million odds

Also curious! But even that does help to appreciate what a 1:4800 chance something is. I really like that frame of reference.