Mobile phone use while driving is common but controversial. Using a cellular telephone while operating a motor vehicle has been shown to increase the risk of accident. Because of this, many governments have made use a cell phone while driving illegal. A 1997 Canadian study and a 2005 Australian study both estimated the risk of a collision when using a cellular telephone was four times higher than the risk when a cellular telephone was not being used. 699 and 456 drivers, respectively, who owned phones, were involved in crashes, and volunteered for the studies were examined. By collecting volunteers' cell phone records, scientists were able to determine who placed telephone calls shortly before the time of crash, and through case-crossover analysis (a technique often used in medical studies of heart-attacks and air pollution) of cell phone habits, calculated the increase in risk. Both studies found that hands-free devices were not considerably safer.
Picture taken form www.cartoonstock.comA more traditional study method was used by the Société de l'assurance automobile du Québec (SAAQ) for their 2003 study. Questionnaires were sent to 175,000 drivers and analysis was done on the 36,078 who responded. The questionnaire asked about driving habits, risk exposure, collisions over the past 24 months, socio-demographic information, and cell phone use. Questionnaires were supported with data from cell phone companies and police crash records. The study found that the overall relative risk (RR) of having an accident for cell phone users when compared to non-cell phone users averaged 1.38 across all groups. When adjusted for kilometers driven per year and other crash risk exposures, RR was 1.11 for men and 1.21 for women. They also found that increased cell phone use correlated with an increase in RR.
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