While the content of the dictionary has expanded and evolved since it was first published, its usage has not changed.
1960s
The need for the ANSI-D20 Data Element Dictionary for Traffic Records Systems was created by the Federal Highway Safety Act of 1966. This Act required states receiving federal highway safety funds to develop better systems for collecting and processing data for operating safety programs. "Traffic Records" refers to records related to:
- Motor vehicle registration
- Driver licensing
- Highway design and operations
- Accidents
- Financial responsibility
- Motor vehicle inspection
- Commercial vehicle reciprocity
- Traffic law enforcement
- Emergency medical services
1970s
Under the leadership of AAMVA, over 300 people from more than 80 public and private organizations participated in a D20 Parent Committee which compiled the dictionary. With funding and computer services provided by the National Highway Traffic Safety Administration (NHTSA) and Federal Highway Administration (FHWA), the first edition of the dictionary was issued in 1979 as the American National Standard ANSI D20-1979.
1980s
In the 1980s, the D20 Parent Committee dissolved. The responsibility for the maintenance of the D20 dictionary was transferred to AAMVA’s Standing Committee on Motor Vehicle Information Systems (MVIS) after a 1984 ballot of the D20 Parent Committee. On May 6, 1986, MVIS formally submitted a request to the American National Standards Institute (ANSI) that AAMVA be accredited as the sponsor charged with maintenance of the D20 Dictionary. ANSI notified AAMVA on August 28, 1986 that the request was approved.
1990s
On October 11, 1993, a second edition of D20 was approved by ANSI as the ANSI Data Element Dictionary for Traffic Records Systems D20-1993. In the second edition, many data elements were updated for greater compatibility with current operating data systems.
In 1998, the third edition of the standard was published as the Data Element Dictionary for Traffic Records Systems, ANSI D20-1998. In the third edition, the Dictionary is synchronized with the AAMVA data repository. The AAMVA repository was developed using the AAMVA Electronic Data Interchange applications (used by the AAMVAnet community nationwide) as a source of reference. These applications encompass the driver licensing, vehicle registration and titling, and motor carrier registration business areas of the departments of motor vehicles in the U.S. and Canada. It is important to note that most of these applications were initially developed using D20 as a reference.
2000s
In 2003 and 2009, the fourth and fifth editions were published. These were minor revisions containing a few updates that were needed to keep element definitions current with their revised uses. These editions are named:
- Data Element Dictionary for Traffic Records Systems, ANSI D20-2002
- ANSI D20 Traffic Records Systems Data Element Dictionary, release 5.0.0
2010s
A new edition was published in 2016 as the D20 Traffic Records Systems Data Element Dictionary, Release 6.0.
When D20 was first established, the ANSI process for developing standards through consensus was selected. The ANSI name not only provided a respected label, but also provided a mechanism for creating a standard that supports data definitions used across Industry, Federal and Jurisdictional organizations. Since it was created, D20 has lagged behind the latest data definition standards and new editions merely introduced updates which were already widely in use. This was a result of the drivers of updates not being able to accommodate the ANSI process, which resulted in D20 just collecting and publishing previously approved changes. AAMVA is dropping the ANSI process with the aim of allowing D20 to be updated more frequently so it can reflect data definitions currently being used.
The business applications and services that AAMVA provides support the exchange of driver and vehicle data, but not the exchange of accident/crash and roadway data. As a result, AAMVA has been unable to keep the D20 updated with this type of information. AAMVA has therefore acknowledged this limitation by restricting the scope of the D20 content so that this new edition and all futures editions will no longer include data definitions for accident/crash and roadway data.