The Role of Supervised Driving Requirements in Graduated Driver Licensing Programs

Foss, Robert D.; Masten, Scott V.; Goodwin, Arthur H.; O’Brien, Natalie P. · 2012 · ROSA P / United States. National Highway Traffic Safety Administration

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Summary

This study investigates the effectiveness of supervised driving requirements within Graduated Driver Licensing (GDL) programs, specifically examining whether mandating specific hours of practice reduces crash rates among teenage drivers. While many U.S. states require parents to certify that teens complete 40 to 60 hours of supervised driving before obtaining an intermediate license, empirical evidence regarding the safety impact of these mandates was previously lacking. The research aimed to determine if the number of required hours influences fatal and nonfatal crash involvement and to assess parental awareness, compliance, and licensing agency enforcement of these requirements. The researchers employed a multi-method approach. First, they conducted a cross-sectional analysis using Fatality Analysis Reporting System (FARS) data from 1986 to 2007 across all 50 states and the District of Columbia to correlate supervised driving requirements with fatal crash rates for 16- and 17-year-olds. Second, they utilized interrupted time-series analysis (ARIMA models) on state crash data to evaluate the impact of policy changes in states that increased required supervised hours, with Minnesota serving as the primary case study due to data availability. Third, the study included telephone interviews with 510 parents of newly licensed teens in five states (Maryland, Minnesota, Ohio, South Carolina, and Washington) to gauge awareness and compliance, alongside contacts with licensing bureaus to assess how requirements were communicated. The crash analyses found no relationship between the number of required supervised driving hours and fatal crash involvement among young drivers. Specifically, requiring any particular number of hours did not significantly lower fatal crash rates for 16-year-olds, and any initial association with higher rates for 17-year-olds disappeared after adjusting for other factors. Similarly, interrupted time-series analyses in Minnesota and other states revealed no significant changes in fatal or serious-injury crash rates following increases in supervised driving requirements. Parent interviews revealed low awareness and enforcement; only 32% of parents correctly identified their state’s required hours, and knowledge of night-driving requirements was even lower (13%). While 96% of parents approved of the requirements, most did not keep written logs, except in Maryland where a log submission mandate resulted in higher tracking rates. Licensing officials in most states failed to proactively communicate these requirements. The study concludes that mandating specific hours of supervised driving does not demonstrably reduce teen crash rates, likely due to poor communication and lack of verification by licensing agencies. The findings suggest that current policies are ineffective because parents are often unaware of the specific requirements and there is little agency oversight. The authors recommend improving communication with parents, providing guidance on supervision techniques, and implementing better tracking mechanisms, such as mandatory logs, to ensure teens receive adequate practice. The research highlights a disconnect between policy intent and implementation, indicating that simply increasing mandated hours without ensuring compliance and awareness yields no safety benefit.

Key finding

Requiring specific amounts of supervised driving hours during the learner stage of graduated driver licensing programs was not associated with lower fatal or serious injury crash rates among 16- and 17-year-old drivers.

Methodology

mixed_methods

Sample size: 510

Provenance

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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.

• learner drivers
• parental management
• graduated licensing
• licensing policy
• novice drivers
• driver education effectiveness

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
• Empirical Findings: observational prevalence