On July 14-16, 2009 the Volpe Center hosted the United States Department of Transportation (US DOT) Federal Railroad Administration’s (FRA) Third Research Needs Workshop on Highway-Rail Grade Crossing Safety and Trespass Prevention (workshop). The primary purpose of this workshop was to bring together nationally and internationally recognized subject matter experts to collaborate, identify and prioritize specific research needs to facilitate the reduction of highway-rail grade crossing and trespass incidents and fatalities for incorporation into the strategic vision of FRA, other US DOT modes and their stakeholders. There were approximately 90 participants, including support staff, over the two-and-a-half day workshop, representing the Federal, State, and local governments, as well as railroads, transit agencies, labor unions, academia, non-profit organizations, and consultants. The Research Needs Workshop was organized into six research needs areas and four cross-cutting areas by the steering committee's recommendation. The research needs areas were: Grade Crossing Modernization, Traffic Patterns, New Technology Opportunities, Regulation and Enforcement, Education and Public Awareness and Institutional Issues. The four cross-cutting areas were Human Factors, Transit-Oriented Communities, Data Requirements and Efforts Related to High Speed Rail. This document provides the supporting and ancillary information to the Proceedings report (in Volume I) including presentations and all generated research needs.