This version of 2015 FARS file was compiled on 5/18/2016. 
These are the annual FARS release files.
Starting from 2015 file release, there will be two folders, one for national and one for Puerto Rico. 
In each folder, there are three zip files for three different formats. The formats are SAS, DBF and CSV.
In the next couple of years, the support for DBF format will be discontinued.
Starting from 2014, Pedestrian and Bicyclist file is included in the file release.
Auxiliary files are included in the SAS, DBF and CSV sets instead of as independent zip files.

On 9/12/2016, the Accident and Vehicles files are updated since the variables DR_DRINK and DRUNK_DR needed 
            to be updated because of the updates to Alcohol Test Results.
            Also on 9/12 the CSV files are regnerated for due to the conversin issues for longitude,latitude.
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FARS Auxiliary Files
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The FARS Auxiliary files are datasets that are derived from the standard FARS datasets: 
1. Accident -> Acc_Aux
2. Vehicle -> Veh_Aux
3. Person -> Per_Aux
These files are joined by the standard key variables.
Please read the following document for additional details: http://www-nrd.nhtsa.dot.gov/Pubs/811364.pdf
For User Manuals, please go to: ftp://ftp.nhtsa.dot.gov/FARS/FARS-Doc/FARS_Auxiliary_Analytical_User_Manuals.zip
For SAS Format Catalog, please go to: ftp://ftp.nhtsa.dot.gov/FARS/Auxiliary_FARS_Files_Formats