Potential for Application of Ignition Interlock Devices to Prohibit Operation of Motor Vehicles by Intoxicated Individuals
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Summary
This 1988 report by the National Highway Traffic Safety Administration (NHTSA) assesses the feasibility and potential application of ignition interlock devices to prevent intoxicated individuals from operating motor vehicles. Prepared in response to Section 203 of the Highway Safety Act of 1987, the study reviews historical development, current technology, legislative status, and the effectiveness of these devices in reducing alcohol-impaired driving. The report focuses primarily on alcohol impairment, noting that technology for detecting drug-impaired driving is not yet feasible due to the complexity and cost of testing for various substances. The report examines two primary technological approaches: performance-based tests and breath alcohol sensors. Historical research on performance tests, such as the Critical Tracking Tester, demonstrated that while these devices could discriminate between sober and highly intoxicated drivers, they struggled with accuracy at moderate Blood Alcohol Concentration (BAC) levels and required individualized calibration. Consequently, interest shifted to breath alcohol sensors. Early breath test devices were deemed impractical due to reliability issues and susceptibility to circumvention, such as using stored air or having a sober person provide the sample. However, recent advancements have produced more accurate sensors with integrated anti-tampering features, including temperature and pressure sensors to verify genuine breath samples and retesting protocols to prevent post-start drinking. NHTSA conducted laboratory tests on three commercially available breath alcohol ignition interlock devices. The results indicated that these devices are reasonably accurate in detecting low BAC levels, specifically around 0.04%, and are resistant to many forms of tampering, such as hot-wiring or push-starting. Despite these improvements, the report notes that uncomplicated strategies to fool the devices still exist, and their effectiveness in real-world conditions remains unproven. At the time of publication, five states had authorized the use of certified ignition interlocks for convicted offenders, with numerous other states considering similar legislation. The report concludes that while ignition interlock technology based on breath alcohol tests is technically feasible, there is insufficient evidence to judge its effectiveness in deterring alcohol-impaired driving or reducing crashes. The authors recommend that these devices should not replace established sanctions like license suspension but may be appropriate as additional conditions for probation or restricted driving privileges. Outstanding issues include determining operational performance, assessing the extent of circumvention, and establishing certification standards. NHTSA plans to support further evaluation through grants and technical assistance to states implementing these programs.
Key finding
Current breath test ignition interlock devices are technically feasible and accurate in laboratory settings, but there is insufficient evidence to determine their effectiveness in deterring alcohol-impaired driving in real-world applications.
Methodology
review
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
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| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | partial | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified_with_issues.
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- Methodological Resource: validation psychometrics