Highways/motorways should be the perfect ground for "self-driving trains" of cars: self-regulating convoys of vehicles going at similar speeds between exits, "a

Highways/motorways should be the perfect ground for "self-driving trains" of cars: self-regulating convoys of vehicles going at similar speeds between exits, "attached" at safe distances. It would dramatically reduce stress and fatigue (and hence accidents) among professional drivers and other heavy users. Particularly in the US, it's an absolute no-brainer. The problem is finding who will pay for the necessary infrastructure.