Graduated driver licensing: the New Zealand experience

Area of Science:

• Public Health
• Traffic Safety
• Road User Behavior

Background:

• A graduated driver licensing (GDL) system was implemented in New Zealand in 1987 for drivers aged 15-24.
• The GDL system included a learner license, a restricted license with specific limitations, and a blood alcohol limit of 0.03 mg%.

Purpose of the Study:

• To evaluate the impact of New Zealand's graduated driver licensing (GDL) system on serious traffic-related injuries and crash rates among young drivers.
• To assess the long-term effectiveness and contribution of GDL restrictions to crash reduction.

Main Methods:

• Analysis of crash statistics and injury data for young drivers before and after GDL implementation.
• Comparison of crash characteristics (e.g., time of day, passenger presence) for drivers with restricted licenses versus those licensed before GDL.
• Longitudinal evaluation of fatal and serious injury crash rates among young drivers over time.

Main Results:

• Early evaluations attributed an 8% reduction in serious injuries to GDL, initially thought to be due to reduced exposure.
• Subsequent analyses showed continued declines in fatalities and hospital admissions, with GDL restrictions correlating with fewer night and passenger-related crashes.
• Fatal and serious injury crash rates for young people remain substantially lower than pre-GDL levels, indicating sustained impact.

Conclusions:

• GDL restrictions have demonstrably contributed to reducing crashes among young drivers, beyond just reduced exposure.
• The effectiveness of the graduated driver licensing system in mitigating young driver crashes has persisted over the long term.
• The GDL system represents a successful public health intervention in improving road safety for young New Zealand drivers.