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Car phones and car crashes: an ecologic analysis
1Department of Medicine, University of Toronto, ON.
Summary
Ecologic analysis suggests cellular telephone use has minimal impact on driving safety. Industry claims of safety based on this analysis may mislead policy decisions regarding mobile phone use while driving.
Area of Science:
- Public Health
- Transportation Safety
- Epidemiology
Background:
- Cellular telephone use has increased dramatically.
- Concerns exist regarding the impact of mobile phone use on driving safety.
- Some jurisdictions have implemented regulations restricting mobile phone use while driving.
Purpose of the Study:
- To evaluate the association between cellular telephone use and motor vehicle collisions.
- To assess the validity of ecologic analysis in this context.
- To inform the policy debate on regulating mobile phone use while driving.
Main Methods:
- Ecologic study design utilizing data from Toronto, Ontario.
- Analysis of 75 hazardous locations with 3,234 total collisions.
- Correlation analysis between collision rates and cellular telephone usage from 1984 to 1993.
Main Results:
- Locations with higher increases in collision rates showed smaller increases in estimated cellular telephone usage.
- Potential protective effects of cellular telephones could not explain observed collision rate magnitudes.
- Ecologic analysis revealed significant biases, potentially obscuring true effects.
Conclusions:
- The impact of cellular telephones on driving ability appears small when compared to biases inherent in ecologic analysis.
- Industry arguments for cellular telephone safety based on ecologic data can be misleading.
- Policy decisions regarding mobile phone use while driving require careful consideration beyond simplistic ecologic analyses.