I recall Popular-Science-ish illustrations of systems like that where you’d drive onto the freeway and your car would hook into a chain of cars to be driven to

I recall Popular-Science-ish illustrations of systems like that where you’d drive onto the freeway and your car would hook into a chain of cars to be driven to a “stop,” where you could unhook. If I understand it correctly, we are just now experimenting with something very like that for trucking, where multiple trucks can convoy, and the systems communicate with each other so that all the vehicles in a convoy adjust their speed simultaneously.