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An evaluation of Nova Scotia's alcohol ignition interlock program
Ward G M Vanlaar1, Marisela Mainegra Hing1, Robyn D Robertson1
1Traffic Injury Research Foundation, Canada.
Nova Scotia's alcohol ignition interlock program significantly reduced drink driving recidivism by up to 90% among participants. The program also showed a general deterrent effect, lowering alcohol-related crashes and charges in the province.
Area of Science:
- Public Health
- Criminology
- Transportation Safety
Background:
- Alcohol ignition interlock programs are implemented to reduce recidivism among convicted drink drivers.
- Nova Scotia implemented its interlock program in 2008.
Purpose of the Study:
- Evaluate the effectiveness of Nova Scotia's alcohol ignition interlock program.
- Assess the program's impact on reducing impaired driving and identify areas for improvement.
Main Methods:
- Utilized conviction and crash records, provincial alcohol-related charge/conviction/crash data, and interlock logged events.
- Employed descriptive statistics, survival analysis, time series analysis, and logistic regression.
Main Results:
- Voluntary participants showed a 90% reduction in recidivism during the program and a 79% reduction after exiting.
- Temporary decreases observed in alcohol-related charges (13.32%) and convictions (9.93%).
- A small but significant decrease in fatal and serious alcohol-related injury crashes occurred post-program implementation.
Conclusions:
- The interlock program demonstrated effectiveness in preventing harm from alcohol-impaired driving compared to its absence.
- Evidence supports the continuation of the alcohol ignition interlock program in Nova Scotia.
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