Motor vehicle

A motor vehicle or road vehicle is a self-propelled wheeled vehicle that does not operate on rails, such as trains or trolleys. 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 automobiles or cars, buses, motorcycles, motorized bicycles, off highway vehicles, light trucks or light duty trucks, and trucks or lorries. These classifications vary according to the legal codes of each country. ISO 3833:1977 is the standard for road vehicles types, terms and definitions.[1] As of 2010 there were more than one billion motor vehicles in use in the world excluding off-road vehicles and heavy construction equipment.[2][3][4] Global vehicle ownership per capita in 2010 was 148 vehicles in operation per 1000 people.[4] The United States has the largest fleet of motor vehicles in the world, with 239.8 million by 2010. Vehicle ownership per capita in the U.S. is also the highest in the world with 769 vehicles in operation per 1000 people.[4] 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

argest new car market.[3][4][5] In 2011, a total of 80 million cars and commercial vehicles were built, led by China, with 18.4 million motor vehicles manufactured. The U.S. 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. They state that the world vehicle population passed the 500 million-unit mark in 1986, and 250 million motor vehicles in 1970. Between 1970 and 1950, the vehicle population doubled roughly every 10 years.[2][3][4] Two U.S. researchers estimate that the world's fleet will reach 2 billion motor vehicles by 2020, with cars representing at leas 50% of all vehicles. Chinas and Indias 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%.[2] 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.[4] In developing countries vehicle ownership rates in cities rarely exceed 200 cars per 1,000 population.