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. In the Philippines, a "tricycle" is a public (for-hire) vehicle consisting of a motorcycle and an attached passenger sidecar, and should not be confused with an unmotorized three-wheeled pedicab is known as a trisikad.

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