I've seen some three wheeled segway-like devices. They compromise stability, because the third wheel lifts if one wheel goes over an object that is taller than

I've seen some three wheeled segway-like devices. They compromise stability, because the third wheel lifts if one wheel goes over an object that is taller than the other. Similarly, they end up leaning backward or foreward over slanted terrain and are easier to tip. IMO, other two wheeled scooters were more practical, but the segway combined their benefits with the ability to be handsfree.