The report doesn't state whether this under or over represents the level of cell phone use amongst drivers, and whether there is a causal relationship.A 2003 study of US crash data states that driver inattention is estimated to be a factor in 20% to 50% of all police-reported crashes.Many jurisdictions have enacted laws to ban handheld mobile phone use.Nevertheless, many jurisdictions allow use of a hands-free device.Mobile phone use while driving is common, but it is widely considered dangerous due to its potential for causing distracted driving and accidents.Due to the number of accidents that are related to conducting calls on a phone while driving, some jurisdictions have made the use of calling on a phone while driving illegal.Currently, being distracted by an "outside person, object, event" (commonly known as "rubbernecking") is the most reported cause of distraction-related accidents, followed by "adjusting radio/cassette/CD". A 2003 study by the University of Utah psychology department measured response time, following distance, and driving speed of a control group, subjects at the legal blood alcohol content (BAC) limit of 0.08%, and subjects involved in cell phone conversations. this is the third in a series of studies that we have conducted evaluating the effects of cell phone use on driving using the car following procedure (see also Strayer & Drews, 2004; and Strayer et al., 2003).Across these three studies, 120 participants performed in both baseline and cell phone conditions.
When adjusted for distance driven per year and other crash risk exposures, RR was 1.11 for men and 1.21 for women.
The Société de l'assurance automobile du Québec (SAAQ), the provincial automobile insurance association in Quebec, conducted a study on driving and cellphones in 2003.
Questionnaires were sent to 175,000 drivers and analysis was done on the 36,078 who responded.
However, large unknowns in each category may increase the inaccuracy of these estimates.
A 2001 study sponsored by the American Automobile Association recorded "Unknown Driver Attention Status" for 41.5% of crashes, and "Unknown Distraction" in 8.6% of all distraction related accidents.