Linqi Xiao (M.S., Rutgers University), a graduate student at Rutgers in Electrical and Computer Engineering, is a Research Assistant at the Center for Population Behavioral Health. Linqi is working with Professors Yingying Chen, PhD and Tammy Chung, PhD on an NIH-funded R21 study to refine the Driving behavior Detection and iDentification (D3) app which is deployed to differentiate various types of risky driving behaviors. The smartphone app will be used to detect risky driving behaviors, as a first step in moving toward just-in-time preventive interventions to reduce harms that might be related to substance use.