Tracking NYC's Traffic Deaths

It's the year of "Vision Zero" but in 2014 there have already been 46 traffic deaths, from bikers to pedestrians to drivers and passengers. WNYC reporters Jim O'Grady and Kat Aaron talk about the new Transportation Nation database, tracking these deaths, and Jim's reporting on one victim -- four-year-old Allison Liao, struck by a car in Flushing, Queens.