The Hyperbike - "as fast as a car."
From the website: www.hyperbike.info
The operator of a Hyperbike uses a total-body climbing, swim-like motion to propel the Hyperbike, while balancing as if on a unicycle. The driver twists his torso, contracts the stomach and back muscles, and alternately extends the arms up and down as in a foot pedal motion, while coordinating with the legs to get the best push and pull from the lower pedals.
The Hyperbike (with its 8-foot wheels) is still in development. Be assured I will keep you up to date on its progress.