At 6MPH and, I'm assuming, a non-trivial time for even "loading" and "unloading" a car, I would not be at all surprised that the total time it would spend reracking cars would end up being significantly longer than just leaving them where they are and taking the extra time to fetch them.
Yeah, particularly if humans also park in the same spaces. I thought after posting that if the robot knows a space is available far away, then maybe by the time it gets there the space is taken by a human! :-)
I can envision tons of opportunities to mess with this robot.
