It is essential that a vehicle have a supply of vitality to drive it. Energy can be extracted from exterior sources, as in the circumstances of a sailboat, a solar-powered car, or an electrical streetcar that uses overhead strains. Energy can be saved, provided it can be converted on demand and the storing medium’s vitality density and power density are adequate to meet the vehicle’s wants. In 2002 there were an estimated 590 million vehicles and 205 million bikes in service on the earth. At least 500 million Chinese Flying Pigeon bicycles have been made, greater than any other single mannequin of auto.
- In 2011, a total of eighty million automobiles and commercial vehicles have been built, led by China, with 18.4 million motor vehicles manufactured.
- Wheels are historic technology, with specimens being discovered from over 5000 years in the past.
- China has the biggest motor vehicle fleet in the