Discussed are the circumstances under which demographic data are collected for traffic-related contacts and violations. The survey also asked if the data collected was stored in an electronically accessible format. At midyear 1999, 9 of the Nation's 49 State law enforcement agencies whose primary duties included highway patrol reported requiring officers to report demographic information on the driver or passengers for all traffic stops. Thirty-one agencies reported collecting the race/ethnicity of drivers receiving traffic-related citations. Fifteen State agencies recorded the driver's race/ethnicity if officers conducted a vehicle or occupant search. A majority of the States that collected racial/ethnic information from traffic stops maintained these data electronically.