What the existing devices do is over ride the driver with hitting the brakes when the computer determine that an accident will occur if there is no intervention.
We are certainly in the early days and caustion is required to be sure the technology development is safe and can be affordable.
There is a lot more technology being developed to improve safety.
Yes and we all know that the cost of technology is improving rapidly as cost drops dramatically. We already have tens of computers in many cars. The cost of cars is still dropping in real dollars even with all the new technology that is being developed.
The delays and cost of such an approach are unacceptable. Effectively any commute option is limited by people to a total door to door trip time of about an hour per day of total travel. That includes loading the cars, stopping at all the locations to pick up and let off cars, and the time to unload at each of those stops.
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I doubt there is any practical way a train could ever meet the hour requirement and cost would be outrageous. You are trying to solve 21st century transportation problems with 19th century train technology. That is a totally dead end approach.
BTW, trains have a very high accident and rest rates with people and vehicles outside of the train. Loading and unloading cars will in particular be very dangerous with drivers doing the work. Having paid people to do it would be far too expensive and slow.
Public transportation is an abject failure that is slowly dying. There are no realistic public transportation solutions because of the monumental problems buttociated with public transit.
