Similarly, a 2010 study from the Highway Loss Data Institute published in February 2010 reviewed auto claims from three key states along with Washington D. prior to cell phone bans while driving and then after.The study found no reduction in crashes, despite a 41% to 76% reduction in the use of cell phones while driving after the ban was enacted.In the US, the number of cell phone subscribers has increased by 1,262.4% between the years 1985-2008.In approximately the same period the number of crashes has fallen by 0.9% (1995–2009) and the number of fatal crashes fallen by 6.2%.The authors expressed concern that misclassification of phone calls due to reporting errors of the exact time of the collisions was a major source of bias with all case-crossover analysis of this issue.In September 2010, the US National Highway Traffic Safety Administration (NHTSA) released a report on distracted driving fatalities for 2009.Nevertheless, many jurisdictions allow use of a hands-free device.Driving while using a hands-free device is not safer than using a handheld phone to conduct calls, as concluded by case-crossover studies, In some cases restrictions are directed only at minors, those who are newly qualified license holders (of any age), or to drivers in school zones.
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.
In addition to voice calling, activities such as texting while driving, web browsing, playing video games, or phone use in general can also increase the risk of an accident.
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.
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.
Driver distraction, a sub-category of inattention, has been estimated to be a contributing factor in 8% to 13% of all crashes.