On average, vehicles seriously injure or kill someone in New York every two hours; last year, 173 pedestrians were killed. Last week Gov. Andrew M. Cuomo signed a bill allowing New York City to enact a citywide default speed limit of 25 miles per hour as part of its Vision Zero campaign to reduce traffic deaths to nil.
When the speed at which a car strikes a pedestrian rises a mere 10 m.p.h. to 40 m.p.h. from 30 the chance of the pedestrians dying rises to 85 percent from 45. The real question is not absolute speed but appropriate speed.
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