AASHTO SLF4-1, AASHTO Safety Leadership Forum IV: Final Report (September 2009), documents the fourth AASHTO Safety Leadership Forum held in May 2009 at Bedford Springs, Pennsylvania. The forum focused on progress toward the AASHTO goal of reducing highway fatalities by half. State departments of transportation were engaged in implementing their strategic highway safety plans at the time of the forum. Preliminary statistics for the preceding year suggested that lasting progress was being made toward that goal. The report was prepared for the National Cooperative Highway Research Program under NCHRP Project 17-42(05). State DOT safety executives and program managers can use the final report as a record of forum discussions on advancing toward the fatality reduction goal.