Evaluation of NHTSA Distracted Driving High-Visibility Enforcement Demonstration Projects in California and Delaware
archive: archived pipeline: cataloged verified
Get this paper ↗ (full text — opens at the source; we link to it, we don't host it)
Summary
This report evaluates the effectiveness of high-visibility enforcement (HVE) demonstration projects aimed at reducing distracted driving in California and Delaware. Motivated by the prevalence of cell phone use while driving and the need to test whether HVE models—previously successful in smaller communities like Hartford and Syracuse—could be effective on a larger, multi-jurisdictional scale, the study assessed the impact of increased police presence combined with paid and earned media campaigns. The programs targeted drivers in the Sacramento Valley region of California (approximately 4 million residents) and the entire state of Delaware (approximately 900,000 residents), both of which have primary enforcement laws banning handheld cell phone use. The study employed a quasi-experimental design with three enforcement waves conducted between November 2012 and June 2013. Control areas were selected for comparison: Portland, Oregon, for California, and Atlantic County, New Jersey, and New Haven County, Connecticut, for Delaware. Data collection methods included analyzing enforcement records (tickets issued, officer hours), conducting roadside observations of driver behavior, administering awareness surveys to motorists, and reviewing crash data. In California, 37 local police departments and the California Highway Patrol issued 10,781 citations, supported by $472,973 in overtime funding. In Delaware, 41 local departments and the State Patrol issued 6,291 citations, supported by $352,387. Media efforts featured the slogan "Phone in One Hand, Ticket in the Other" across television, radio, and online platforms. Results indicated significant increases in public awareness of the enforcement campaigns. In California, awareness of enforcement rose from 56% to 73%, and slogan recognition increased from 16% to 57%. In Delaware, enforcement awareness rose from 28% to 38%, and slogan recognition doubled from 7% to 19%. Roadside observations showed that handheld cell phone use decreased significantly in both intervention areas. In California, use dropped from 4.1% to 2.7% (a 34% reduction), while in Delaware, it fell from 4.5% to 3.0% (a 33% reduction). Although control areas also saw reductions, the decrease in Delaware was significantly greater than in its control areas. The reduction in California was confounded by legislative efforts in Oregon to increase fines, which likely influenced behavior in the control group. Crash data analyses did not reveal a significant effect on distraction-related crashes, likely due to the small proportion of crashes coded as distraction-related. The study concludes that high-visibility enforcement can be successfully implemented over large, diverse geographic areas and effectively reduces handheld cell phone use while driving. The findings support the use of HVE as a countermeasure to encourage compliance with distracted driving laws. While the magnitude of the effect in California is less certain due to confounding variables in the control area, the overall results reaffirm that publicized enforcement campaigns modify driver behavior and increase awareness of legal restrictions.
Key finding
Observed handheld cell phone use decreased by 34 percent in California and 33 percent in Delaware following the implementation of high-visibility enforcement campaigns.
Methodology
field_study
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 (6 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 | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
Information type
What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).
- Applied Guidance: countermeasure evaluation, policy recommendations
- Empirical Findings: observational prevalence