TIRF USA Ignition Interlock Project: United States


As part of the 2019 AIIPA proceedings, four fact sheets were created to highlight the content shared at the annual conference. These fact sheets contain an overview of interlocks in the context of the criminal justice system, regulation changes, technology, and recent research. The fact sheet on alcohol interlocks and the criminal justice system highlights the roles of both police agencies and courts within the delivery of interlock programs in many jurisdictions. A checklist to review interlock regulations was created to assist program administrators in adopting changes in rules and regulations to ensure consistency across legislation, policy, and practice. Due to continued technological advances, interlock programs are now more flexible and tailored to the level of participant supervision in accordance with risk. As such, a Technology Update was created to summarize advancements in fuel cell sensors, device calibration, device testing and field-testing, and GPS. Lastly, an overview of recent research was prepared to spotlight new interlock research findings from a state program evaluation and the influence of laws on fatal crashes, as well as strategies to address the problem of non-installation by offenders. New research continues to inform program administrators, legislators, and the public about the effectiveness of alcohol ignition interlocks programs and program features. These findings also provide much-needed guidance to shape the development of operational practices and new program features.

The Traffic Injury Research Foundation USA, Inc. (TIRF USA) in partnership with the Association of Ignition Interlock Program Administrators (AIIPA), and TIRF Canada released 2018 Ignition Interlock Installations: State Data. This study is based on 2018 interlock installation data collected from state agencies in the US. It provides a benchmark for state ignition interlock program administrators and impaired driving stakeholders to measure interlock usage and growth in interlock programs. These data provide a comprehensive picture of interlock installations across the United States and are a useful benchmark for state ignition interlock program administrators and the impaired driving community to measure interlock program participation. State data show significant growth in the installation of interlocks, including a 20% increase in new ignition interlocks installed in 2018 compared to 2016. Even though consistent progress has been made increasing installations in the past decade, there is plenty of room for growth using strong strategies to ensure offenders required to install a device do so.

Project Sponsor(s):

Project Status: Published

If you would like more information about this or any other project, contact:

Traffic Injury Research Foundation USA, Inc.
Corporate Office | T: 202-507-6334 |