On July 14-16, 2009 the Volpe Center hosted the United States Department of Transportation (USDOT) Federal Railroad Administration's (FRA) Third Research Needs Workshop on Highway-Rail Grade Crossing Safetyand Trespass Prevention (workshop). The primary purpose of this workshop was to bring together nationally and internationallyrecognized 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 USDOT 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.