You are of course correct, but speed does give an upper bound on how quickly you decelerate. Anyways, I got curious and looked up accident statistics in Denmark [1], and only ~10% of accidents that result in fatalities happen on freeways (where speed is highest), ~56% happens on country roads (second highest speed and more objects that will decelerate you quickly) and the remaining happen in the city. The authorities estimated that excessive speed played a major factor in 43% of the accidents.[1] https://www.vejdirektoratet.dk/sites/default/files/2021-12/D... (in danish)
EDIT: 43%, not 46%
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