Great concept, but there's a few problems.- Very limited safety buffer. Mechanical failure or human-inspired miscues would be very dangerous- Mixing "free-roaming" cars with these "car trains" means the intentionally distracted drivers in the car trains would not be in a position to quickly react. e.g. A truck tire tread comes flying at you, a drunk driver swerves into you, or a deer/animal runs into the road.- Perception of mistakes made by computers vs humans. It may be that humans have a likelihood of 1% to get into an accident while the computer makes mistakes that cause .01% (made these up). The first accident caused by the computer that could have been avoided had the human been driving would be tougher to accept despite the odds being greatly in its favor. That number would have to be 0% to be acceptable, and 0% is impossible to achieve.