Honda has developed a self-balancing one-wheeled electric vehicle called U3-X.
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Top speed 6 km/h
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Weight: 10 kg
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Autonomy: 1 hour
Examples of a two-wheeled vehicles are from Segway and Toyota:
Video
Check out the video to get an idea
U3-X Personal Mobility Prototype (2010)
U3-X links
Honda’s portfolio