The simple idea that helped prevent millions of traffic deaths

The simple idea that helped prevent millions of traffic deaths

Road injuries remain the leading cause of death for everyone between the ages of 5 and 29 — ahead of malaria, ahead of war and homicide, ahead of every disease we spend more time worrying about. | Sharon Steinmann/Houston Chronicle via Getty Images Let me start with the most local of local stories: the intersection down the street from my apartment in Brooklyn, where Columbia Street meets Summit Street. Since my family moved into the neighborho…