Honda has come up with a unicycle called the U3-X. The device is intended to aid elderly people to be more mobile.

The device has an omin-directional driving system that integrates a large wheel that moves forward and backward, and smaller wheels that move from side to side. The wheels can even produce diagonal movement.

The U3-X weighs 22 pounds, and operates for an hour on a single charge to the lithium-ion batteries.

In the video it appears that the seat is too small, combined with tiny foot pedals, makes the U3-X very uncomfortable to ride, as opposed to the Segway which allows for a standing position.

The commercial success of the U3-X seems unlikely, much as it has been for the Segway, but eventually these device concepts should lead to something far more useful.