3. Honda U3-X
While many deride the Segway for being a stupid transportation idea that failed (although we don't quite see it as a failure), Honda's U3-X certainly deserves to be questioned.
Announced in 2009, the U3-X is a one-wheeled personal transportation device that's yet to see the light of day. It allowed riders to travel 6km per hour, so not quite a brisk walk, and was powered with a lithium-ion battery that lasted around an hour. Basically, you could go almost nowhere using it.
To stay upright and move it used the same balancing technique that Honda's robot ASIMO used to stand upright, run and jump. As an invention it's certainly intriguing, but it's by far a bigger failure than the Segway was.
While it may not have ever turned up, at least the U3-X gave us this wonderfully weird announcement video.
Next: the top two worst ideas in technology history
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