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A tricycle, sometimes abbreviated to trike, is a human-powered three-wheeled vehicle. Some tricycles, such as cycle rickshaws and freight trikes, are used for commercial purposes, especially in the developing world, particularly Africa and Asia. In the West, adult-sized tricycles are used primarily for recreation, shopping, and exercise. Tricycles are favoured by children, the disabled, and senior adults for their apparent stability versus a bicycle; however a conventional trike may exhibit poor dynamic lateral stability, and the rider should exercise appropriate operating caution when cornering and operating technique to avoid tipping the trike over. Designs such as recumbents or others which place the rider lower relative to the wheel axles have a lower centre of gravity, and/or designs with canted wheels may be more resistant to lifting inner wheels or tipping during fast sharp turns, but still require operator awareness and technique.