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A motor vehicle is a self-propelled road vehicle, commonly wheeled, that does not operate on rails, such as trains or trams. The vehicle propulsion is provided by an engine or motor, usually by an internal combustion engine, or an electric motor, or some combination of the two, such as hybrid electric vehicles and plug-in hybrids. For legal purposes motor vehicles are often identified within a number of vehicle classes including cars, buses, motorcycles, off-road vehicles, light trucks and regular trucks. These classifications vary according to the legal codes of each country. ISO 3833:1977 is the standard for road vehicles types, terms and definitions. 〔(【引用サイトリンク】title=ISO 3833:1977 )〕 Generally to avoid requiring handicapped persons from having to possess an operator's license to use one, or requiring tags and insurance, powered wheelchairs will be specifically excluded by law from being considered motor vehicles. As of 2010 there were more than one billion motor vehicles in use in the world excluding off-road vehicles and heavy construction equipment.〔〔〔 Global vehicle ownership per capita in 2010 was 148 vehicles in operation per 1000 people.〔 The United States has the largest fleet of motor vehicles in the world, with 239.8 million in 2010. Vehicle ownership per capita in the US is also the highest in the world with 769 vehicles in operation per 1000 people.〔 The People's Republic of China has the second largest fleet in the world, with slightly more than 78 million vehicles and since 2009 became the world's largest new car market.〔〔〔 In 2011, a total of 80 million cars and commercial vehicles were built, led by China, with 18.4 million motor vehicles manufactured. ==Ownership trends== The US publisher Ward's, estimate that as of 2010 there were 1.015 billion motor vehicles in use in the world. This figure represents the number of cars; light, medium and heavy duty trucks; and buses, but does not include off-road vehicles or heavy construction equipment. The world vehicle population passed the 500 million-unit mark in 1986, from 250 million motor vehicles in 1970. Between 1970 and 1980, the vehicle population doubled roughly every 10 years.〔〔(【引用サイトリンク】title=Automobiles and Truck Trends )〕 Two US researchers estimate that the world's fleet will reach 2 billion motor vehicles by 2020, with cars representing at least 50% of all vehicles. China’s and India’s automobile fleets are expected to grow at an annual rate of around 7 or 8%, while the slowest growth is expected in the United States, with less than 1% a year, and Western Europe, with 1 to 2%.〔 See Chapter 1, Note 1, pp. 261: the authors ''use the term cars here to represent all conventional motor vehicles, be they cars, sport utility vehicles, minivans, trucks, buses, motorcycles, scooters, or three-wheeled motorized vehicles.''"〕 Navigant Consulting forecasts that the global stock of light-duty motor vehicles will reach 2 billion units in 2035. Global vehicle ownership in 2010 was 148 vehicles in operation per 1000 inhabitants, a ratio of 1:6.75 vehicles to people, slightly down from 150 vehicles per 1000 inhabitants in 2009, a rate of 1:6.63 vehicles to people.〔 The global rate of motorization increased in 2013 to 174 vehicles per 1000 inhabitants. In developing countries vehicle ownership rates rarely exceed 200 cars per 1,000 population.〔(【引用サイトリンク】title=Motorization, Demand & City Development )〕 The following table summarizes the evolution of vehicle registrations in the world from 1960 to 2012: 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「motor vehicle」の詳細全文を読む スポンサード リンク
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