NASS GES Codebooks

2009 NASS General Estimates System (GES) Codebook. Version 28Jun10. UMTRI Transportation Data Center. October 2010.
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The NASS GES data sets for calendar year 2009 document 44,648 crashes, involving 107,469 occupants in 77,594 vehicles, and 3,521 nonmotorists.

GES datasets dating from calendar year 2002 include multiple response variables. Please exercise caution when comparing data to prior years. Also, as in the case of FARS, in 2005 NHTSA added parked and working vehicles (not considered traffic units) to the file. These vehicles are NOT in the ADAAS vehicle file, and the occupants if any, are in the non-motorist file.

In the 2009 GES file there are 186 vehicles with no occupants and these vehicles are not represented in the Occupant level data set. Prior years of GES data had a similar number of such cases.

There were many changes to the 2009 NASS GES, most of which are the result of NHTSA's efforts to standardize variables in NASS GES and FARS. Additions, deletions, and changes may be found in the NASS GES Analytic User's Manual 1988-2009 or the NASS GES Coding and Editing Manual: 2009 NASS GES Manuals