IMHO, there are just too many things that could go wrong. If I'm travelling at 700 mph, I want miles of separation, not inches. I can't believe that travelling in a vacuum tube hundreds or thousands of miles long would be nearly as safe as the tried and true aviation industry.
Absolutely. It is an interesting concept but as always, the devil is in the details. Not to mention the costs which will be hard to justify. That being said, given the novelty, this could possibly be used in Las Vegas where the glitz and money-is-no-object attitudes don't hinder the practicality issues. Or a Disney type of venue as well?
A rapidly developing reality is AI is not all that intelligent and in many cases flat out stupid.
There is an age old science and computer maxim that applies: Garbage in-garbage out. AI is nothing more than a nested linkage of computer algorithms. The problem with any algorithm or algorithmic nest is they're ultimately a human product limited by the skills, creativity, insight and life experience of the designer(s). This is compounded by a common inherent AI inability to situationally morph when encountering a non-normative (non-programed) demand.
Recently in my dear Houston a fleet of AI driven driverless cars caused a major traffic jam on two crossing thoroughfares when the traffic lights there went to the fail-safe flashing red lights for all lanes of traffic. This fail-safe happens often enough given the regularity and effects on traffic control boxes of our rain deluges. People, through either courtesy or self-preservation, negotiate one-at-a-time through the fail-safe. The AI cars came individually to the intersection, followed their red light algorithm protocols, and dead stopped. Soon enough the 8 lanes of traffic were all also AI filled dead stopped, and remained so until Houston police contacted the AI control center in California. With voice commands from the scene to the center cleared the intersection one AI car at a time.
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