What about self driving bicycles? You just need to peddle, and the integrated road traffic system removed the error prone human element completely from the equation.

A bicyclist must adjust his weight to handle the bike. That seems tough to automate away.

Gyros can do amazing things these days...i have no doubt we'll see something like this in our lifetime (I'm hoping for a self balancing unicycle).

It's called Solowheel: http://solowheel.com/