For over 30 years, the Fatality Analysis Reporting System (FARS) has been the most referenced source for U.S. fatal crash data. Since 1988, the National Automotive Sampling System General Estimates System (NASS GES) has been an essential source for non-fatal injury crash data. Both systems have used fairly similar sets of data elements (variables) to describe crashes, but the differences in the systems coding details have required separate software, documentation, coding, and analysis. In 2009, the National Highway Traffic Safety Administration (NHTSA) took a big step toward the goal of unifying the FARS and NASS GES data definitions and coding, simplifying crash data entry and analysis while also reducing costs and errors. The Data Standardization Work Group, consisting of representatives from NHTSA, the Federal Motor Carrier Safety Administration (FMCSA) and the Federal Highway Administration (FHWA), was chartered in 2006. The mission of the work group was to improve the compatibility of FARS and NASS GES and to bring both systems into alignment with the Model Minimum Uniform Crash Criteria (MMUCC), the guideline now used by nearly all States in the development and revision of their crash report forms and databases.


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