Countermeasures That Work – Drug-Impaired Driving [Traffic Tech]
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Summary
This document, published by the National Highway Traffic Safety Administration (NHTSA) in 2021, serves as a technical summary of effective countermeasures for drug-impaired driving, extracted from the 10th edition of *Countermeasures That Work*. The paper addresses the persistent safety challenge of drivers operating vehicles under the influence of alcohol and other drugs. While alcohol-impaired driving is well-understood with established metrics like blood alcohol concentration (BAC), drug-impaired driving presents significant complexities. These include the wide variety of licit and illicit substances, the lack of established dose-impairment relationships for most drugs, and varying elimination rates that make detection difficult. A primary motivation for this review is the need to guide State Highway Safety Offices in selecting evidence-based strategies, particularly given that crash risk increases significantly when drugs are combined with alcohol. The paper evaluates behavioral countermeasures, focusing specifically on the enforcement of drug-impaired driving laws. It categorizes effectiveness based on research support, rating enforcement as "promising/likely effective" (three stars). The analysis highlights that enforcement is complicated by the fact that drug impairment is often only investigated when a driver’s BAC is low but impairment is obvious, as many states do not impose additional penalties for drug impairment alongside alcohol violations. Consequently, the primary method for enforcement relies on training law enforcement officers to detect impairment rather than relying solely on chemical tests, as reliable point-of-contact screening devices for drugs are still under development. The document details a three-tiered training framework for officers. The first level is an 8-hour course on "Drugs That Impair Driving," which provides foundational knowledge of drug signs and medical conditions mimicking impairment. The second level is the 16-hour Advanced Roadside Impaired Driving Enforcement (ARIDE) program, designed to help officers recognize impairment indicators to establish probable cause for arrest. The highest level is the Drug Evaluation and Classification (DEC) program, which certifies officers as Drug Recognition Experts (DREs). This intensive training involves nine days of classroom instruction and supervised field evaluations, enabling officers to identify specific drug categories causing impairment. The time to implement these enforcement strategies is short, typically within three months, though DRE certification requires significant time investment. Costs are primarily associated with officer training and time, with a DRE evaluation taking 45 minutes to an hour. The significance of this report lies in its identification of critical gaps in current drug-impaired driving countermeasures. It concludes that while enforcement is a key component, there have been no studies directly examining its effectiveness in reducing crashes, and overall evaluation of drug-specific countermeasures remains limited. The paper underscores that improvements in data quality and detection methods are in early stages and suggests that countermeasures for prescription and over-the-counter drugs may need to differ from those for illicit substances. Ultimately, it reinforces that addressing drug-impaired driving requires a combination of laws, enforcement, and education, with officer training currently serving as the most viable immediate intervention.
Key finding
The one consistent finding across studies is that the risk of driver impairment increases when drugs are combined with alcohol.
Methodology
review
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (7 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 3 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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Information type
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- Applied Guidance: countermeasure evaluation