See report by Direct Line Insurance: Mobile Phone report
Independent Expert Group on Mobile Phones ihttp://www.iegmp.org.uk/ includes a summary of evidence that states
5.208 There is strong experimental evidence that engaging in a mobile phone conversation impairs drivers’ ability to react to potentially hazardous road situations. The impairment appears to be greater than that associated with merely listening to a radio or engaging in a relatively “automatic” task such as repeating back words heard over the phone; is evident during a “casual” conversation; increases along with the mental workload imposed by the conversation; is greater in elderly drivers; and is unaffected by mode of phone use (hand-held versus hands-free). There is less evidence as to whether aspects of driving other than speed or accuracy of reaction to changing road circumstances differ according to mode of phone operation. Consistent with what might be expected on the basis of common experience, one study found that placing a call on a hand-held set is associated with a transient impairment in the basic control of the vehicle. The extent to which this “peripheral” effect adds to the risk posed by the more sustained “central” effects that are shared by hand-held and hands-free operation appears to be unknown at present. It should be noted that none of the studies reviewed above compared the effects on driving performance of phone use to the effects caused by conversing with a passenger. Thus it remains to be established whether an in-car conversation that places a cognitive load on the driver equivalent to that imposed by a mobile phone call has similarly detrimental effects on performance. There are, however, good reasons to suppose that the effects of an in-car conversation will be less than those associated with the use of a phone. In contrast to the individual on the other end of a phone call, a passenger can monitor the road situation and “pace” the interaction according to circumstances (for example, suspending conversation during an overtaking manoeuvre). In addition, a passenger can act as a second “pair of eyes”, alerting the driver to potential hazards.
An Australian study, published in July 2005
http://www.bmj.com/cgi/content/abstract/bmj.38537.397512.55v1 notes
Driver's use of a mobile phone up to 10 minutes before a crash was associated
with a fourfold increased likelihood of crashing . Risk was raised irrespective
of whether or not a hands-free device was used.
(There is something strange about this page - go to the bottom of the page to get a summary of the paper).
A recent study of young drivers texting
http://www.democratandchronicle.com/apps/pbcs.dll/article?AID=/20070714/NEWS01/707140333&template=printart
notes that a recently completed study of 19- to 24-year-olds in driving
simulators found that motorists who text message while driving are six times
more likely to be distracted and have an accident. When a driver texts, driving
patterns change. For example, the response time to brake is 23 percent slower
1.077 seconds when texting and driving compared with 0.881 seconds when
unencumbered.
Victoria was the first Australian State to ban the use of hand-held phones while
driving.
http://www.officeofroadsafety.wa.gov.au/documents/mobiles.pdf
Countries which have banned hand-held cell phone usage:
http://mobileoffice.about.com/cs/traveladvice/qt/usingcellphone.htm
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