True, but the Grand Challenge cars had to find their own way, while roads and/or tunnels could have premarked paths. Any general use vehicles would still have t

True, but the Grand Challenge cars had to find their own way, while roads and/or tunnels could have premarked paths. Any general use vehicles would still have to have the capability for human control, though, for reasons like the snowstorms we're getting here in Ottawa. I would miss the thrill of driving a motorcycle, though.