And when one of the robot trucks has some mechanical or electronic failure, what happens?Japan drives 4 big trucks 13 feet apart at highway speed!
No big deal right? Well only the first one in the convoy has a human driver. The other 3 follow the lead truck. All 4 could be driven by robot control.
On a related subject, why would anyone except a lazy bum put his safety in the hands of a robot-driven vehicle?