JPER845043_SM – Supplemental material for Do Denser Neighborhoods Have Safer Streets? Population Density and Traffic Safety in the Philadelphia Region GuerraErick DongXiaoxia KondoMichelle 2019 <p>Supplemental material, JPER845043_SM for Do Denser Neighborhoods Have Safer Streets? Population Density and Traffic Safety in the Philadelphia Region by Erick Guerra, Xiaoxia Dong and Michelle Kondo in Journal of Planning Education and Research</p>