Site Report: Wichita, Kansas Field Test of Combined Speed, Alcohol, and Safety Belt Enforcement Strategies
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Summary
This report evaluates a field test conducted in Wichita, Kansas, from September 1991 to July 1992, designed to determine if combined enforcement strategies for speeding, alcohol-impaired driving (DWI), and seatbelt non-use could reduce these violations and related crashes. Sponsored by the National Highway Traffic Safety Administration and executed by the Wichita Police Department, the project operated under the theme "Traffic Trifecta: Buckle Up - Slow Down - Drive Sober." The hypothesis was that publicizing simultaneous enforcement of multiple laws would increase the perceived risk and severity of penalties, thereby enhancing deterrence. Topeka, Kansas, served as a comparison site to control for external trends. The experimental design involved five sequential combined enforcement strategies, each supported by a two-month public information and education (PI&E) campaign. Evaluation methods included measuring driver awareness and self-reported behavior via surveys at driver licensing offices, observing vehicle speeds and seatbelt usage at specific locations, and analyzing accident data using ARIMA models. The study aimed to assess changes in enforcement activity, driver perceptions, and crash outcomes relative to the comparison site. Results indicated that the program’s effectiveness varied significantly by violation type due to resource constraints. DWI enforcement activity increased significantly, leading to a 20% to 35% reduction in proxies for alcohol-related crashes. However, speeding enforcement activity actually decreased during the project period, resulting in no positive changes in speed outcomes. Similarly, while seatbelt enforcement saw moderate increases, seatbelt usage did not improve. Driver surveys showed no change in awareness of the combined program or self-reported drinking-driving frequency, though perceived risk of DWI enforcement did rise. The authors conclude that extraordinary external events—including abortion protests, gang-related violence, and severe weather—forced the reallocation of police resources away from traffic enforcement. Consequently, the study could not fairly test the combined enforcement concept for speeding and seatbelts, as the necessary intensity of enforcement was not maintained. The findings suggest that while combined enforcement can be effective against specific violations like DWI when enforcement intensity is high, it requires significantly increased enforcement of all target violations to be effective across multiple categories. The Wichita test demonstrated that without sustained enforcement resources, the combined strategy fails to produce broad behavioral changes.
Key finding
Wichita's combined-enforcement program resulted in a 20% to 35% decline in proxies for alcohol-related crashes but failed to produce positive changes in speeding or seatbelt use outcomes due to resource reallocation.
Methodology
field_study
Provenance
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| 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 |
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| 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 | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Applied Guidance: countermeasure evaluation, policy recommendations
- Empirical Findings: observational prevalence