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Graduated driver licensing decal law: effect on young probationary drivers
Allison E Curry1, Melissa R Pfeiffer, Russell Localio
1Center for Injury Research and Prevention, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA. currya@email.chop.edu
American Journal of Preventive Medicine
|December 21, 2012
Summary
New Jersey's decal law increased citations for graduated driver licensing (GDL) violations but reduced crashes for young drivers. This law enhanced probationary driver safety and supports evidence for similar GDL laws.
Area of Science:
- Traffic safety research
- Public health policy
- Driver behavior analysis
Background:
- Decal laws internationally aid enforcement of graduated driver licensing (GDL) restrictions.
- New Jersey enacted the first U.S. decal law on May 1, 2010.
- Prior evaluation of decal law effectiveness was lacking.
Purpose of the Study:
- To assess New Jersey's decal law impact on GDL citation rates for drivers under 21.
- To evaluate the law's effect on police-reported crashes among young probationary drivers.
- To estimate the number of crashes prevented by the decal law.
Main Methods:
- Linked New Jersey licensing and crash databases (Jan 2008-May 2011).
- Calculated monthly rates of citations and crashes for probationary drivers.
- Used negative binomial regression to analyze pre- and post-law periods (Jan 2008-Jan 2010 vs. May 2010-May 2011).
Main Results:
- 14% increase in GDL citation rates in the first year post-law.
- 9% reduction in police-reported crashes among young drivers.
- Estimated 1624 crashes prevented for young probationary drivers.
Conclusions:
- New Jersey's decal law appears to improve probationary driver safety.
- Findings support the effectiveness of decal laws in enhancing GDL programs.
- Provides evidence for policymakers considering decal laws to bolster GDL safety.
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