This report describes traffic law enforcement data collected by the Iowa State Patrol (ISP) related to traffic stops made by Troopers from October 1, 2000 through March 30, 2002. The data contained in this report summarizes the activities of approximately 435 troopers who are assigned to 15 Posts throughout the State of Iowa. The purpose of this voluntary data collection process was to provide the ISP with the ability to review traffic law enforcement variables in relation to traffic stops. The methodology for this research project was developed and implemented by ISP. Following the data collection period, the Iowa Division of Criminal and Juvenile Justice Planning (CJJP) was asked to assist in the analysis and reporting phase of this ambitious project.