Given the fact that both the Navy and the Air Force regularly fly pilotless aircraft for surveillance and combat missions, the idea of a driverless fork truck seems somewhat of a no-brainer. Why not pilotless cargo aircraft such as FedEx and UPS? Why not semi-trucks moving intercity without drivers? How would your answer differ if we had highways that were dedicated to the truck-only traffic, either on an exclusive or time-allocated basis? Where do you think the concept of probotics will eventually end up?