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Segway transportation on the streets of Florence, in Italy . The Segway PT is a two-wheeled, self-balancing transportation machine . Computers and motors in the base of the device keep the Segway PT upright when powered on with balancing enabled. A user commands the Segway to go forward by shifting their weight forward on the platform, and backward by shifting their weight backward. The Segway notices, as it balances, the change in its center of mass, and first establishes and then maintains a corresponding speed, forward or backward. Gyroscopic sensors and fluid-based leveling sensors are used to detect the shift of weight. To turn, the user manipulates a control on the handlebar left or right.