«Convoy mode» would make sense, no? It references a cult movie to bootI think the accepted term is called platooning.
Caravanning is probably more correct but in many places it means towing an RV trailer.
Volvo has been very vocal about this idea for many years. Pre FSD. Less air resistance too. “Hooking” on to others for segments of your journey, automatically planning and finding next one to “hook” up to, and automatically sharing costs I guess.
We have a lot of actual convoys over the mountains, especially in the winter, and this would make sense in snow storms so the cars could very closely follow the plowing truck, lean back and drink som chocolate, and and not worry about sight. But that’s a very specific and limited use. I can see this replace long-range trains in many cases (with better sleeping positions for the car seats) behind commercial trucks crossing the continents anyway (although just freight should actually be a thing for trains).