Mature response you got there. You fail to realize that “significant number” is a subjective term. The fatality difference between 25 and 30 mph is 8%. Only one study in this sample is valid and it’s terribly outdated so doesn’t account for newer vehicle safety features, such as auto brake. None of the data was collected in NYC either. Regardless, it doesn’t take a genius to know that higher speed means harder impact and greater injury. I’m saying it’s cost benefit. Why not make the limit 10 mph then? That would decrease severe injury/ fatality even more, right? But then delivery trucks wouldn’t make it around the city, school buses wouldn’t arrive on time, etc. Like I said, cost benefit. 15-25 mph in a school zone during school hours? I’m in agreement given the risk there. But major roads after hours? Assuming drivers are obeying red lights/ stop signs and pedestrians are obeying walking signals, the benefit of a drastically lowered speed limit becomes negligible in all aspects except generating revenue.