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PrefaceIn December 2015, RAND Corporation researchers produced an online tool called the Motor Vehicle Prioritizing Interventions and Cost Calculator for States (MV PICCS) for the National Center for Injury Prevention and Control at the Centers for Disease Control and Prevention (CDC). The purpose of this tool, which is available to the public at www.cdc.gov/motorvehiclesafety/calculator/ (CDC, 2015), is to support states and local communities in making evidence-based resource allocation decisions relating to the implementation of effective evidence-based interventions for preventing motor vehicle-related injury.In 2017, the team completed an update to the tool as part of a project led by the National Governors Association, funded by CDC, to work with states and governors' offices to strengthen strategies to reduce highway and traffic injuries and fatalities. The work includes updates to some of the data used, updates to some of the assumptions and methods to derive the data, and a full redesign of the user interface of the tool. This report documents which data, assumptions, and methods we updated. The audience for this report is the users of the online tool, state and local health and safety officials seeking information on the effectiveness and costs of the 14 motor vehicle injury prevention interventions included in MV PICCS.The more complete documentation, which includes discussion of how we selected interventions for inclusion in the tool and how we programmed the tool, is available in Ringel et al., 2015. RAND researchers have also undertaken related work that used the data in the tool to conduct policy analyses of traffic safety spending. This work was sponsored by the Robert Wood Johnson Foundation. The main report is Ecola, Batorsky, and Ringel, 2015. Fou...