==========================
FARS Auxiliary Files
--------------------
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

===================
#   Update Notes  #
===================
03/02/2022: 
This is the first release of the 2020 FARS annual file.
    1. Publish VPICDECODE and VPICTRAILERDECODE files. These files are created using NHTSA's vPIC tool and contains the vPIC decode results for cleanly decoded VINs. 
       For detailed information about this file, please refer to "Product Information Catalog and Vehicle Listing (vPIC) Analytical User's Manual, 2020" 
    2. ADS related data fields are discontinued.
    3. 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

03/08/2022: 
ACCIDENT.CSV file for Puerto Rico is updated to add the missing WEATHER column.

04/03/2023: 
This is the first release of the 2020 FARS final file.

4/01/2024: The following updates have been made to the files:
updated three auxiliary files and MIACC, MIDRVACC, and MIPER files for both SAS and CSV.