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Worldwide it was estimated that 1.2 million people were killed and 50 million more were injured in motor vehicle collisions in 2004.〔(【引用サイトリンク】title=WHO | World report on road traffic injury prevention )〕 Also in 2010 alone, around 1.23 million people were killed due to traffic collisions. This makes motor vehicle collisions the leading cause of death among children 10 – 19 years of age (260,000 children die a year, 10 million are injured) and the sixth leading preventable cause of death in the United States (45,800 people died and 2.4 million were injured in 2005).〔 〕 It is estimated that motor vehicle collisions caused the death of around 60 million people during the 20th century around the same number of World War II casualties. Modern crash statistics often focus on reportable injury crashes (which include deaths) rather than reporting on deaths alone. It is believed that serious crashes are often significantly under-reported, under-recorded and misclassified and that the completeness of reporting may vary over time and between sources. ==Trends== Road toll figures in developed nations show that car collision fatalities have declined since 1980. Japan is an extreme example, with road deaths decreasing to 5,115 in 2008, which is 25% of the 1970 rate per capita and 17% of the 1970 rate per vehicle distance travelled. In 2008, for the first time, more pedestrians than vehicle occupants were killed in Japan by cars.〔(Pedestrians become chief victims of road accident deaths in 2008 )〕 Besides improving general road conditions like lighting and separated walkways, Japan has been installing intelligent transportation system technology such as stalled-car monitors to avoid crashes. In developing nations, statistics may be grossly inaccurate or hard to get. Some nations have not significantly reduced the total death rate, which stands at 12,000 in Thailand in 2007, for example.〔(365 Days for Stopping Accident Deaths )〕 In the United States, twenty-eight states had reductions in the number of automobile crash fatalities between 2005 and 2006.〔(People Killed in Motor Vehicle Crashes, by State, 2005-2006 )〕 55% of vehicle occupants 16 years or older in 2006 were not using seat belts when they crashed. Road fatality trends tend to follow Smeed's law, an empirical schema that correlates increased fatality rates per capita with traffic congestion. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Epidemiology of motor vehicle collisions」の詳細全文を読む スポンサード リンク
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