A study by the NHTSA of 241 drivers in 100 vehicles over the course of
one year found that most car accidents are caused by drowsiness or distractions in and out of the car. According to the study, reaching for
moving objects while behind the wheel increased the risk of accidents by
9 times, followed by drowsiness (4x), rubbernecking (3.7x) and reading
(3x). Dialing a hand-held device increased risk by less than 3 times,
while talking and/or listening on a hand-held device increased it by 1.3

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