This report documents the proceedings from the 4th Integrated Transportation Management Systems (ITMS) Conference, ITMS: A Key Strategy to Optimize Surface Transportation System Performance, held in Newark, New Jersey on July 15-18, 2001. The purpose of the conference was to identify potential initiatives and opportunities to help advance the state-of-the-art in planning, designing, deploying, operating, and evaluating ITMS. Vol. 1 summarize the presentations from the general sessions and the breakout sessions. Vol. 2 white papers include defining ITMS, institutional issues and opportunities, planning for ITMS, designing for ITMS, management and operations, traffic management strategies and operational plans, and performance measurement.