The Effectiveness of Traffic Policing in Reducing Traffic Crashes

Bates, Lyndel; Soole, David; Watson, Barry · 2012 · Crossref

DOI: 10.1057/9781137007780_6

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Summary

This chapter reviews the effectiveness of traffic law enforcement strategies in reducing traffic crashes, focusing on high-risk behaviors such as drink/drug driving, speeding, red-light running, and seat belt non-use. Motivated by the significant global burden of road trauma—estimated at over one million deaths and $518 billion in annual costs—the authors examine how enforcement modifies driver behavior through apprehension and deterrence. The review is grounded in deterrence theory, which posits that enforcement effectiveness depends on the perceived certainty, severity, and swiftness of punishment, as well as the perceived risk of detection. The authors synthesize existing literature to evaluate various enforcement methods, including overt and covert operations, manual and automated technologies, and random versus targeted deployments. For drink and drug driving, the review highlights the efficacy of random breath testing (RBT) and selective breath testing (SBT). Evidence indicates RBT reduces fatal crashes by up to 36% and overall crashes by up to 22%, while SBT shows similar reductions. Random drug testing (RDT) is noted as having less empirical support regarding crash reduction, with much of the evidence relying on self-reported intentions rather than crash data. Regarding speeding, automated detection devices like speed cameras are shown to reduce average vehicle speeds by up to 15% and fatal/serious injury crashes by up to 44%. Point-to-point camera systems are also identified as promising for reducing speeds and congestion. Findings for red-light enforcement are inconclusive. While red-light cameras reduce right-angle crashes, they may increase rear-end collisions, potentially offsetting net safety benefits. Meta-analyses show mixed results, with some studies indicating a 15% increase in total crashes and others showing significant reductions in specific crash types, though methodological limitations persist. For seat belt use, the review emphasizes that primary legislation (allowing stops solely for seat belt violations) is significantly more effective than secondary legislation. Primary laws are associated with a 2–18% reduction in fatal crashes and a 20–36% increase in observed seat belt use. The authors conclude that effective traffic policing requires a tailored mix of overt and covert, automated and manual strategies to maximize both general and specific deterrence. Key best practices include ensuring enforcement is intensive, unpredictable through random deployment, and supported by public education campaigns to heighten the perceived risk of detection. The chapter also notes the need for future research and enforcement adaptation to address emerging risks, such as mobile phone use while driving, and the potential for technological innovations like point-to-point speed enforcement to further enhance road safety.

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.

Topics

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• automated enforcement cameras
• regulatory evaluation
• dui enforcement
• comparative international
• incidence prevalence
• driver education effectiveness

Information type

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• Applied Guidance: countermeasure evaluation
• Empirical Findings: crash risk outcomes, observational prevalence