Car telephone use and road safety : an overview prepared for the European Commission

NHTSA · 2009 · ROSA P / European Commission

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Summary

This 2009 report, prepared for the European Commission by Jeanne Breen Consulting, provides a comprehensive overview of the relationship between mobile telephone use and road safety. The study was motivated by the rapid proliferation of mobile phones since the mid-1980s and the emergence of new technologies, such as hands-free devices and visual displays, which present evolving challenges for traffic management. The report synthesizes behavioral, epidemiological, and observational research to assess the extent of use, its impact on driving performance, crash risks, and the effectiveness of current policies. The analysis draws on observational studies, self-reported surveys, and meta-analyses of scientific literature. Observational data from Europe, the US, and Australia indicate that 1% to 6% of drivers use telephones while driving, with higher prevalence among younger males. The report distinguishes between physical, visual, auditory, and cognitive distractions, identifying cognitive distraction—the diversion of attention to conversation—as the primary safety hazard. Crucially, the review finds that hands-free devices cause comparable cognitive distraction to hand-held phones, impairing performance similarly. Text messaging is identified as particularly dangerous due to combined visual, physical, and cognitive demands, causing drivers to keep their eyes off the road 400% longer than normal. Key findings reveal significant impairments in driving performance. Reaction times are 50% slower than normal driving conditions and 30% slower than driving with a blood alcohol concentration of 80mg/100ml. Drivers exhibit reduced situation awareness, slower braking reactions, and increased risk-taking, such as accepting shorter gaps. Epidemiological studies demonstrate that telephone use increases the likelihood of crash involvement by a factor of four. Heavy users are twice as likely to crash as minimal users. Estimates suggest mobile phone use contributes to approximately 2,600 deaths and 330,000 serious injuries annually in the US, and nearly 600 deaths and hospital admissions annually in the Netherlands. The report concludes that while hand-held bans are widespread in the EU and other regions, hands-free bans remain rare due to enforcement difficulties, despite evidence showing no safety advantage. Public attitudes often underestimate the risks, erroneously believing hands-free use is safe. The authors recommend urgent improvements in data collection, including recording mobile phone use in crash reports. They advocate for evidence-based interventions that address both hand-held and hands-free use, potentially through in-vehicle technological enforcement. Additionally, the report encourages stricter company policies, such as complete bans on phone use while driving, and calls for better ergonomic design of in-vehicle information systems to mitigate distraction.

Key finding

Mobile phone use while driving increases the likelihood of crash involvement by a factor of four and slows driver reaction times by 50% compared to normal driving conditions.

Methodology

review

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