NCHRP Report 755: Comprehensive Costs of Highway-Rail Grade Crossing Crashes presents a process for estimating the costs of highway-rail grade crossing crashes. A spreadsheet tool to facilitate use of this cost estimation process was also developed and may be downloaded at Departments of transportation (DOTs) and other public agencies use such estimates in making decisions about investments to install safety devices or reconstruction to provide grade separation of the road and rail line. The report will be helpful to officials of such agencies who must identify and assess the merits of investments proposed to enhance safety at grade crossings.