A high rate of traffic collisions occur at signalized intersections. The use of historical and static traffic signal timing data in conjunction with witness testimony has typically been used to assist accident reconstructionists in determining the status of a traffic signal leading up to and at the time of a collision. Recent technological advancements in signal timing data collection, recording, and logging can provide accident reconstructionists with a new and more robust method of analyzing signalized intersection collisions. This paper presents the history and current state of signal of the art for traffic signalization; Signal Timing Data Loggers. We also present how to obtain, analyze, and interpret the data logger data and possible applications of such to accident reconstruction.