http://en.wikipedia.org/wiki/Motor_vehicle


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Note added at 1 hr (2007-12-01 19:38:28 GMT)
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In the United States, a motor vehicle is "a vehicle, not run on rails, that is designed to be self propelled or propelled by electric power obtained from overhead trolley wires, but does not include a motor assisted cycle"

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Note added at 1 hr (2007-12-01 19:39:07 GMT)
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A motor vehicle is a machine which incorporates a motor (sometimes known as an engine), and which is used for transportation. The internal combustion engine is the most common motor choice, although electric motors or other types are sometimes used. Land vehicles are usually equipped with wheels, and usually operate on roads.

Some common examples:

* a motorized bicycle
* a motorcycle
* an automobile
* a truck
* a bus
* a motorboat