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FARS National and Puerto Rico Files
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The FARS Files directory structure has been modified and made consistent across all years, beginning with 1975.  
In each folder, there are two zip files, one in SAS format and one in CSV format.

Auxiliary files are included in the SAS and CSV sets instead of as independent zip files.
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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

Updates
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5/18/2016:  
The Puerto Rico files were regnerated to correct issues with alcohol results.

8/14/2020:  
The National accident.csv file has been updated for the variable "Longitute" precision from 4-digit to 8-digits.

3/2/2022:  
1. Starting from this file release, the FARS file directory structure has been changed beginning 1982. 
Auxiliary files are zipped separately from the rest of the FARS files. 
For each year, there are two folders, one for national and one for Puerto Rico. 
In each folder, there are four zip files 
    - one zip file for Auxiliary SAS files 
    - one zip file for Auxiliary CSV files
    - one zip file for non-Auxiliary SAS files
    - one zip file for non-Auxiliary CSV files
2. PER_AUX, VEH_AUX and ACC_AUX files are updated for both National and Puerto Rico

04/03/2023: 
Added vPICDecode CSV and SAS files. The vPICDecode files are created using NHTSA's vPIC tool and contain the vPIC 
decode results for cleanly decoded VINs. For detailed information about these files, please refer to "Product 
Information Catalog and Vehicle Listing (vPIC) Analytical User's Manual, 2021" 
https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/813348