==========================
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  #
===================
09/28/2018: DBF format file is discontinuted. Only CSV and SAS version of FARS data will be available.
10/22/2019: This is the release of FARS 2018 annual file.
	Starting from 2018, DRUG related information is stored in DRUG.xxx file instead of in PERSON.xxx file.
10/30/2019: acc_aux file is updated for National CSV and SAS zip files.
08/14/2020: The National accident.csv file has been updated for the variable "Longitute" precision from 4-digit to 8-digits.
12/18/2020: This is the release of FARS 2018 final files. 
 	- Starting from this file release, the CSV files contain the (ID, TEXT) value for look-up data variables.
 	- Starting from this file release, VINDecode files are not published any more.
03/02/2022: The following updates are made for 2018 final files:
	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. Update Race and Hispanic Origin for Louisiana
	3. PER_AUX, VEH_AUX and ACC_AUX files are updated
	4. MIACC, MIDRVACC, and MIPER files are updated
	5. Update many cases for roadway related data elements for the States DE, KS, and NY.
		DE: Land Use, National Highway System, Functional System
		KS: Land Use, National Highway System, Functional System, Route Signing, Ownership, Trafficway Identifier
		NY: Land Use, National Highway System, Functional System, Route Signing, Ownership, Trafficway Identifier
   	6. 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