Evaluation of the Kentucky Graduated Driver Licensing System
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Summary
This study evaluated the effectiveness of Kentucky's Graduated Driver Licensing (GDL) system, which was enacted in 1996, by analyzing crash data, licensing records, and survey responses. Researchers compared crash rates and costs for teen drivers before (1993-1995) and after (1997-2000) the program's implementation, supplemented by driving logs from over 1,255 students and surveys of law enforcement and judges. The analysis revealed a significant 31 percent reduction in crashes for 16-year-old drivers, including decreases in fatal, injury, nighttime, and alcohol-related incidents, translating to an estimated annual cost savings of $36 million. However, the study found no significant reduction in crashes for drivers older than 16.5 years, indicating that the intermediate license level lacked sufficient restrictions. The authors concluded that while the permit stage was effective, the program needed expansion to include stricter nighttime and passenger restrictions for older teens to further improve safety.
Key finding
Kentucky's GDL program significantly reduced crashes and associated costs for 16-year-old permit drivers but failed to reduce crash rates for drivers older than 16.5 years due to insufficient restrictions in the intermediate licensing stage.
Methodology
mixed_methods
Sample size: 1255
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 (8 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | skipped | empty | — | — | 4 | 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 | — | 3 | 2026-06-01 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 1 | 2026-06-03 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-01; verification: verified.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- graduated licensing
- driver education effectiveness
- learner drivers
- licensing policy
- novice drivers
- parental management
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: policy recommendations, countermeasure evaluation
- Empirical Findings: crash risk outcomes