United States Department of Transportation
i
Impacts of public policy on safety : graduated driver’s license
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2008-12-01
[PDF-1.90 MB]
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Abstract:This study evaluated the effectiveness of Missouri’s GDL policy. This study found a substantial decrease in crash involvement rates among drivers aged 15-18 in Missouri while drivers aged 19 or older have a moderate decrease in the rates. This study also found Missouri teenage drivers aged 16-18 had a small but steady decrease in their fatality rates while the drivers in neighboring states with weaker GDL provisions experienced either increase or fluctuation. This study examined how teenage drivers aged 15-18 with instruction permits or intermediate licenses comply with GDL restrictions or requirements. The percent of crash-involved drivers aged 15 having a qualified front seat passenger improved substantially over the years. However, the compliance rate on the not-driving-alone restriction in early morning (1:00 a.m.- 5:00 a.m.) has been low. This study found there have been significant variations among counties in terms of crash rates among drivers aged 15-18. The teenage drivers in urban counties with major cities and higher median household income had a more pronounced decrease in crash involvement and at-fault crashes compared to rural counties with lower median household income after the implementation of GDL.
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