A tricycle (often abbreviated to trike) is a three-wheeled vehicle. While tricycles are often associated with the small three-wheeled vehicles used by pre-school age children, they are also used by adults for a variety of purposes. In the United States and Canada, adult-sized tricycles are used primarily by older persons for recreation, shopping, and exercise. In Asia and Africa, tricycles are used primarily for commercial transportation, either of passengers in pedicabs, or of freight and deliveries.
Human-powered trikes are usually powered by pedals, although some models have hand cranks. Motorized trikes can be powered with a variety of methods, including motorcycle engines, smaller automatic transmission scooter motors, and electric motors. The term "tricycle" may or may not include motorized Three Wheeled Cars, depending on local laws.
More info at: http://en.wikipedia.org/wiki/Tricycle
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