Real‐World Personal Conversations Using a Hands‐Free Embedded Wireless Device While Driving: Effect on Airbag‐Deployment Crash Rates

A wireless device embedded in the vehicle allowed the user to engage in a personal hands-free conversation (HFC), and automatically placed an emergency notification call to an OnStar call center if the vehicle was involved in a crash in which its airbag deployed. A database stored the exact counts, start timestamps, and billed durations of all HFC and airbag notification calls. In 30 months of naturalistic driving, there were 91 million HFC calls from an average of 323,994 drivers per month who made calls. There were 14 airbag deployments in 276 million driver-minutes of HFC conversation for an exposed incidence rate of 5.08 airbag crashes per 100 million driver-minutes. There were 2,023 airbag deployments in an estimated 24.7 billion driver-minutes of no HFC conversation for a not-exposed incidence rate of 8.18 airbag crashes per 100 million driver-minutes. The crash incidence rate ratio (IRR) is the ratio of these two rates or 0.62 (95% C.I. 0.37 to 1.05). Sensitivity analyses controlled for the impact on the crash IRR of estimated time spent driving per day and calls by passengers. Counting all crashes as much as 20 minutes later than a call as related to that call gave similar results. We conclude that for personal conversations using a hands-free embedded device the risk of an airbag crash is somewhere in a range from a moderately lower risk to a risk near that of driving without a recent personal conversation. These results are not consistent with the large increase in crash risk reported in epidemiological studies using the case-crossover method.

[1]  D. Strayer,et al.  Cell phone-induced failures of visual attention during simulated driving. , 2003, Journal of experimental psychology. Applied.

[2]  Valdimar Briem,et al.  Behavioural effects of mobile telephone use during simulated driving. , 1995 .

[3]  Ram R. Bishu,et al.  The Effect of Hands-Free Cellular Telephone Conversation Complexity on Choice Response Time in a Detection Task , 2004 .

[4]  James E. Prieger,et al.  The Impact of Driver Cell Phone Use on Accidents , 2004 .

[5]  Paul Atchley,et al.  Conversation Limits the Functional Field of View , 2004, Hum. Factors.

[6]  O Paltiel.  Cellular telephones and traffic accidents. , 1997, The New England journal of medicine.

[7]  R. Tibshirani,et al.  Association between cellular-telephone calls and motor vehicle collisions. , 1997, The New England journal of medicine.

[8]  H Alm,et al.  Changes in driver behaviour as a function of handsfree mobile phones--a simulator study. , 1994, Accident; analysis and prevention.

[9]  Stephen Legg,et al.  The effect of cell phone type on drivers subjective workload during concurrent driving and conversing. , 2003, Accident; analysis and prevention.

[10]  Frank A. Drews,et al.  What do drivers fail to see when conversing on a cell phone?: (577202012-002) , 2004 .

[11]  H Alm,et al.  The effects of a mobile telephone task on driver behaviour in a car following situation. , 1995, Accident; analysis and prevention.

[12]  Michael J. Goodman,et al.  NHTSA's Research Program on Wireless Phone Driver Interface Effects , 2005 .

[13]  Ming Fang,et al.  Collision and Violation Involvement of Drivers Who Use Cellular Telephones , 2003, Traffic injury prevention.

[14]  F Bellavance.  Linking data from different sources to estimate the risk of a collision when using a cell phone while driving , 2005 .

[15]  David L. Strayer,et al.  Driven to Distraction: Dual-Task Studies of Simulated Driving and Conversing on a Cellular Telephone , 2001, Psychological science.

[16]  François Bellavance,et al.  Wireless telephones and the risk of road crashes. , 2003, Accident; analysis and prevention.

[17]  Susan Pardee Baker.  Digit preference in reported time of collision , 1971 .

[18]  Anne T McCartt,et al.  Cell Phones and Driving: Review of Research , 2006, Traffic injury prevention.

[19]  Luis Garcia-Larrea,et al.  Interference of Cellular Phone Conversations with Visuomotor Tasks: An ERP Study , 2001 .

[20]  J M Violanti,et al.  Cellular phones and traffic accidents: an epidemiological approach. , 1996, Accident; analysis and prevention.

[21]  Robert Tibshirani,et al.  Is Using a Car Phone like Driving Drunk , 1997 .

[22]  J. Violanti.  Cellular phones and traffic accidents. , 1997, Public health.

[23]  Oskar Juhlin,et al.  COMBINING MOBILE PHONE CONVERSATIONS AND DRIVING – STUDYING A MUNDANE ACTIVITY IN ITS NATURALISTIC SETTING , 2003 .

[24]  M. Woodward,et al.  Systematic review and meta-analysis of strategies for the diagnosis of suspected pulmonary embolism , 2005, BMJ : British Medical Journal.

[25]  Saurabh Bhargava,et al.  Driving Under the (Cellular) Influence: The Link between Cell Phone Use and Vehicle Crashes , 2007 .

[26]  J C Stutts,et al.  The role of driver distraction in crashes: an analysis of 1995-1999 Crashworthiness Data System Data. , 2001, Annual proceedings. Association for the Advancement of Automotive Medicine.

[27]  Robert Tibshirani,et al.  Cellular telephones and motor‐vehicle collisions: Some variations on matched‐pairs analysis , 1997 .

[28]  A Drory,et al.  Effects of Rest and Secondary Task on Simulated Truck-Driving Task Performance , 1985, Human factors.

[29]  Richard J. Hanowski,et al.  Driver Distraction in Commercial Vehicle Operations , 2009 .

[30]  Thomas A. Dingus,et al.  The 100-Car Naturalistic Driving Study Phase II – Results of the 100-Car Field Experiment , 2006 .

[31]  J M Violanti,et al.  Cellular phones and fatal traffic collisions. , 1998, Accident; analysis and prevention.

[32]  D. E. Irwin,et al.  Conversation Disrupts Visual Scanning of Traffic Scenes , 2001 .

[33]  K. Rothman.  Epidemiology: An Introduction , 2002 .

[34]  Oskar Juhlin,et al.  Drivers Using Mobile Phones in Traffic: An Ethnographic Study of Interactional Adaptation , 2007, Int. J. Hum. Comput. Interact..

[35]  Frank A. Drews,et al.  What do Drivers Fail to See When Conversing on a Cell Phone? , 2004 .

[36]  K P Quinlan.  Cellular telephones and traffic accidents. , 1997, The New England journal of medicine.

[37]  Matthew Witte,et al.  Effect of cellular telephone conversations and other potential interference on reaction time in a braking response. , 2003, Accident; analysis and prevention.

[38]  David E. Irwin,et al.  Conversation Disrupts Change Detection in Complex Traffic Scenes , 2004, Hum. Factors.

[39]  K J Rothman,et al.  Cause-specific mortality in cellular telephone users. , 1999, JAMA.

[40]  Thomas A. Dingus,et al.  The Impact of Driver Inattention on Near-Crash/Crash Risk: An Analysis Using the 100-Car Naturalistic Driving Study Data , 2006 .

[41]  Joshua T Cohen,et al.  A Revised Economic Analysis of Restrictions on the Use of Cell Phones While Driving , 2003, Risk analysis : an official publication of the Society for Risk Analysis.

[42]  R. Tibshirani,et al.  Interpretation and bias in case-crossover studies. , 1997, Journal of clinical epidemiology.